561690172 has 12 divisors (see below), whose sum is σ = 988640856. Its totient is φ = 279221360.

The previous prime is 561690169. The next prime is 561690191. The reversal of 561690172 is 271096165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405154 + ... + 406537.

It is an arithmetic number, because the mean of its divisors is an integer number (82386738).

Almost surely, 2^561690172 is an apocalyptic number.

It is an amenable number.

561690172 is a deficient number, since it is larger than the sum of its proper divisors (426950684).

561690172 is a wasteful number, since it uses less digits than its factorization.

561690172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811868 (or 811866 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 561690172 is about 23700.0036286917. The cubic root of 561690172 is about 825.0854748293.

The spelling of 561690172 in words is "five hundred sixty-one million, six hundred ninety thousand, one hundred seventy-two".