Number of the day: 661441

Properties of the number 661441:

661441 is a cyclic number.
661441 = 11 × 157 × 383 is a sphenic number and squarefree.
661441 has 3 distinct prime factors, 8 divisors, 13 antidivisors and 595920 totatives.
661441 has a semiprime digit sum 22 in base 10.
Reversing the decimal digits of 661441 results in a sphenic number.
661441 = 330721² - 330720² = 30071² - 30060² = 2185² - 2028² = 1055² - 672² is the difference of 2 nonnegative squares in 4 ways.
661441 is the sum of 2 positive triangular numbers.
661441 is the difference of 2 positive pentagonal numbers in 3 ways.
661441 = 146² + 309² + 738² is the sum of 3 positive squares.
661441² = 358105² + 556116² is the sum of 2 positive squares in 1 way.
661441² is the sum of 3 positive squares.
661441 is a proper divisor of 1531¹³⁰ - 1.
661441 is palindromic in (at least) base 5.