56957209 has 3 divisors (see below), whose sum is σ = 56964757. Its totient is φ = 56949662.

The previous prime is 56957207. The next prime is 56957213. The reversal of 56957209 is 90275965.

It is a happy number.

The square root of 56957209 is 7547.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 56957209 - 2¹ = 56957207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56957203) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3774 + ... + 11320.

Almost surely, 2^56957209 is an apocalyptic number.

56957209 is the 7547-th square number.

56957209 is the 3774-th centered octagonal number.

It is an amenable number.

56957209 is a deficient number, since it is larger than the sum of its proper divisors (7548).

56957209 is an frugal number, since it uses more digits than its factorization.

56957209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094 (or 7547 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 43.

The cubic root of 56957209 is about 384.7537842160.

The spelling of 56957209 in words is "fifty-six million, nine hundred fifty-seven thousand, two hundred nine".