561521404 has 24 divisors (see below), whose sum is σ = 1008182448. Its totient is φ = 273490560.

The previous prime is 561521399. The next prime is 561521419. The reversal of 561521404 is 404125165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121887 + ... + 126409.

It is an arithmetic number, because the mean of its divisors is an integer number (42007602).

Almost surely, 2^561521404 is an apocalyptic number.

It is an amenable number.

561521404 is a deficient number, since it is larger than the sum of its proper divisors (446661044).

561521404 is a wasteful number, since it uses less digits than its factorization.

561521404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5323 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 561521404 is about 23696.4428554161. The cubic root of 561521404 is about 825.0028302321.

Adding to 561521404 its reverse (404125165), we get a palindrome (965646569).

The spelling of 561521404 in words is "five hundred sixty-one million, five hundred twenty-one thousand, four hundred four".