564255891 has 24 divisors (see below), whose sum is σ = 864133920. Its totient is φ = 353569536.

The previous prime is 564255889. The next prime is 564255931. The reversal of 564255891 is 198552465.

564255891 is a `hidden beast` number, since 5 + 6 + 4 + 2 + 558 + 91 = 666.

It is not a de Polignac number, because 564255891 - 2¹ = 564255889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (564255691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138601 + ... + 142613.

It is an arithmetic number, because the mean of its divisors is an integer number (36005580).

Almost surely, 2^564255891 is an apocalyptic number.

564255891 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

564255891 is a deficient number, since it is larger than the sum of its proper divisors (299878029).

564255891 is a wasteful number, since it uses less digits than its factorization.

564255891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955 (or 4952 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 564255891 is about 23754.0710405606. The cubic root of 564255891 is about 826.3398569616.

The spelling of 564255891 in words is "five hundred sixty-four million, two hundred fifty-five thousand, eight hundred ninety-one".