Number of the day: 1667613

Carl Ludwig Siegel was born on this day 120 years ago.

Properties of the number 1667613:

1667613 = 3 × 555871 is semiprime and squarefree.
1667613 has 2 distinct prime factors, 4 divisors, 19 antidivisors and 1111740 totatives.
1667613 has a sphenic digit sum 30 in base 10.
1667613 has an oblong digit sum 30 in base 10.
1667613 = 833807² - 833806² = 277937² - 277934² is the difference of 2 nonnegative squares in 2 ways.
1667613 is the difference of 2 positive pentagonal numbers in 1 way.
1667613 = 38² + 85² + 1288² is the sum of 3 positive squares.
1667613² is the sum of 3 positive squares.
1667613 is a divisor of 1237²⁶⁴⁷ - 1.
1667613 = '1667' + '613' is the concatenation of 2 prime numbers.
1667613 = '166' + '7613' is the concatenation of 2 semiprime numbers.
1667613 is an emirpimes in (at least) the following bases: 11, 15, 21, 25, 26, 27, 33, 34, 35, 36, 53, 56, 69, 73, 76, 81, 84, 87, 91, 93, 96, 98, and 99.