56757209 has 2 divisors, whose sum is σ = 56757210. Its totient is φ = 56757208.

The previous prime is 56757193. The next prime is 56757257. The reversal of 56757209 is 90275765.

56757209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 1210000 = 7453^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 56757209 - 2⁴ = 56757193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56757269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28378604 + 28378605.

It is an arithmetic number, because the mean of its divisors is an integer number (28378605).

Almost surely, 2^56757209 is an apocalyptic number.

It is an amenable number.

56757209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56757209 is an equidigital number, since it uses as much as digits as its factorization.

56757209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 56757209 is about 7533.7380496006. The cubic root of 56757209 is about 384.3029135665.

The spelling of 56757209 in words is "fifty-six million, seven hundred fifty-seven thousand, two hundred nine".