561553138 has 16 divisors (see below), whose sum is σ = 863546040. Its totient is φ = 273715200.

The previous prime is 561553121. The next prime is 561553147. The reversal of 561553138 is 831355165.

It can be written as a sum of positive squares in 4 ways, for example, as 462809169 + 98743969 = 21513^2 + 9937^2 .

It is a junction number, because it is equal to n+sod(n) for n = 561553097 and 561553106.

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, 175618 + ... + 178786.

Almost surely, 2^561553138 is an apocalyptic number.

561553138 is a deficient number, since it is larger than the sum of its proper divisors (301992902).

561553138 is a wasteful number, since it uses less digits than its factorization.

561553138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373.

The product of its digits is 54000, while the sum is 37.

The square root of 561553138 is about 23697.1124401265. The cubic root of 561553138 is about 825.0183714305.

The spelling of 561553138 in words is "five hundred sixty-one million, five hundred fifty-three thousand, one hundred thirty-eight".