561644924 has 12 divisors (see below), whose sum is σ = 1003791264. Its totient is φ = 274847424.

The previous prime is 561644903. The next prime is 561644933. The reversal of 561644924 is 429446165.

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, 1493549 + ... + 1493924.

It is an arithmetic number, because the mean of its divisors is an integer number (83649272).

Almost surely, 2^561644924 is an apocalyptic number.

It is an amenable number.

561644924 is a deficient number, since it is larger than the sum of its proper divisors (442146340).

561644924 is a wasteful number, since it uses less digits than its factorization.

561644924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987524 (or 2987522 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 561644924 is about 23699.0490104561. The cubic root of 561644924 is about 825.0633188010.

The spelling of 561644924 in words is "five hundred sixty-one million, six hundred forty-four thousand, nine hundred twenty-four".