56357209 has 2 divisors, whose sum is σ = 56357210. Its totient is φ = 56357208.

The previous prime is 56357207. The next prime is 56357239. The reversal of 56357209 is 90275365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 810000 = 7453^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 56357209 - 2¹ = 56357207 is a prime.

It is a super-2 number, since 2×56357209² = 6352270012539362, which contains 22 as substring.

Together with 56357207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56357207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28178604 + 28178605.

It is an arithmetic number, because the mean of its divisors is an integer number (28178605).

Almost surely, 2^56357209 is an apocalyptic number.

It is an amenable number.

56357209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56357209 is an equidigital number, since it uses as much as digits as its factorization.

56357209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 56357209 is about 7507.1438643468. The cubic root of 56357209 is about 383.3979847267.

The spelling of 56357209 in words is "fifty-six million, three hundred fifty-seven thousand, two hundred nine".