564903981 has 12 divisors (see below), whose sum is σ = 829349820. Its totient is φ = 370428480.

The previous prime is 564903973. The next prime is 564904013. The reversal of 564903981 is 189309465.

It is a happy number.

564903981 is a `hidden beast` number, since 56 + 490 + 39 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20848356 + 544055625 = 4566^2 + 23325^2 .

It is not a de Polignac number, because 564903981 - 2³ = 564903973 is a prime.

It is a super-2 number, since 2×564903981² = 638233015499296722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564903961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513936 + ... + 515033.

It is an arithmetic number, because the mean of its divisors is an integer number (69112485).

Almost surely, 2^564903981 is an apocalyptic number.

It is an amenable number.

564903981 is a deficient number, since it is larger than the sum of its proper divisors (264445839).

564903981 is a wasteful number, since it uses less digits than its factorization.

564903981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029036 (or 1029033 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 564903981 is about 23767.7087873442. The cubic root of 564903981 is about 826.6561069114.

The spelling of 564903981 in words is "five hundred sixty-four million, nine hundred three thousand, nine hundred eighty-one".