561398356 has 24 divisors (see below), whose sum is σ = 1018762920. Its totient is φ = 270369792.

The previous prime is 561398353. The next prime is 561398359. The reversal of 561398356 is 653893165.

It is an interprime number because it is at equal distance from previous prime (561398353) and next prime (561398359).

It can be written as a sum of positive squares in 4 ways, for example, as 83101456 + 478296900 = 9116^2 + 21870^2 .

It is a super-2 number, since 2×561398356² = 630336228239005472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561398353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44640 + ... + 55816.

It is an arithmetic number, because the mean of its divisors is an integer number (42448455).

Almost surely, 2^561398356 is an apocalyptic number.

It is an amenable number.

561398356 is a deficient number, since it is larger than the sum of its proper divisors (457364564).

561398356 is a wasteful number, since it uses less digits than its factorization.

561398356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11643 (or 11641 counting only the distinct ones).

The product of its digits is 583200, while the sum is 46.

The square root of 561398356 is about 23693.8463741116. The cubic root of 561398356 is about 824.9425639843.

The spelling of 561398356 in words is "five hundred sixty-one million, three hundred ninety-eight thousand, three hundred fifty-six".