56965581 has 6 divisors (see below), whose sum is σ = 82283630. Its totient is φ = 37977048.

The previous prime is 56965577. The next prime is 56965609. The reversal of 56965581 is 18556965.

It is a happy number.

56965581 is a `hidden beast` number, since 5 + 6 + 9 + 65 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39576681 + 17388900 = 6291^2 + 4170^2 .

It is not a de Polignac number, because 56965581 - 2² = 56965577 is a prime.

It is a super-2 number, since 2×56965581² = 6490154837335122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56965561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3164746 + ... + 3164763.

Almost surely, 2^56965581 is an apocalyptic number.

It is an amenable number.

56965581 is a deficient number, since it is larger than the sum of its proper divisors (25318049).

56965581 is a wasteful number, since it uses less digits than its factorization.

56965581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6329515 (or 6329512 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 56965581 is about 7547.5546370994. The cubic root of 56965581 is about 384.7726346298.

The spelling of 56965581 in words is "fifty-six million, nine hundred sixty-five thousand, five hundred eighty-one".