56567309 has 2 divisors, whose sum is σ = 56567310. Its totient is φ = 56567308.

The previous prime is 56567297. The next prime is 56567311. The reversal of 56567309 is 90376565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 1020100 = 7453^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 56567309 - 2⁴ = 56567293 is a prime.

Together with 56567311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56567359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28283654 + 28283655.

It is an arithmetic number, because the mean of its divisors is an integer number (28283655).

Almost surely, 2^56567309 is an apocalyptic number.

It is an amenable number.

56567309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56567309 is an equidigital number, since it uses as much as digits as its factorization.

56567309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 56567309 is about 7521.1241845884. The cubic root of 56567309 is about 383.8738305294.

The spelling of 56567309 in words is "fifty-six million, five hundred sixty-seven thousand, three hundred nine".