56638969 has 2 divisors, whose sum is σ = 56638970. Its totient is φ = 56638968.

The previous prime is 56638961. The next prime is 56638973. The reversal of 56638969 is 96983665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 27962944 = 5355^2 + 5288^2 .

It is a cyclic number.

It is not a de Polignac number, because 56638969 - 2³ = 56638961 is a prime.

It is a super-2 number, since 2×56638969² = 6415945618765922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56638961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28319484 + 28319485.

It is an arithmetic number, because the mean of its divisors is an integer number (28319485).

Almost surely, 2^56638969 is an apocalyptic number.

It is an amenable number.

56638969 is a deficient number, since it is larger than the sum of its proper divisors (1).

56638969 is an equidigital number, since it uses as much as digits as its factorization.

56638969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 52.

The square root of 56638969 is about 7525.8865922893. The cubic root of 56638969 is about 384.0358604567.

The spelling of 56638969 in words is "fifty-six million, six hundred thirty-eight thousand, nine hundred sixty-nine".