561139924 has 36 divisors (see below), whose sum is σ = 1030537620. Its totient is φ = 267329920.

The previous prime is 561139903. The next prime is 561139933. The reversal of 561139924 is 429931165.

It can be written as a sum of positive squares in 2 ways, for example, as 313644100 + 247495824 = 17710^2 + 15732^2 .

Its product of digits (58320) is a multiple of the sum of its prime factors (1080).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076784 + ... + 1077304.

It is an arithmetic number, because the mean of its divisors is an integer number (28626045).

Almost surely, 2^561139924 is an apocalyptic number.

It is an amenable number.

561139924 is a deficient number, since it is larger than the sum of its proper divisors (469397696).

561139924 is a wasteful number, since it uses less digits than its factorization.

561139924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1055 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 561139924 is about 23688.3921784489. The cubic root of 561139924 is about 824.8159609070.

The spelling of 561139924 in words is "five hundred sixty-one million, one hundred thirty-nine thousand, nine hundred twenty-four".