56812909 has 2 divisors, whose sum is σ = 56812910. Its totient is φ = 56812908.

The previous prime is 56812901. The next prime is 56812913. The reversal of 56812909 is 90921865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34515625 + 22297284 = 5875^2 + 4722^2 .

It is a cyclic number.

It is not a de Polignac number, because 56812909 - 2³ = 56812901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56812901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28406454 + 28406455.

It is an arithmetic number, because the mean of its divisors is an integer number (28406455).

Almost surely, 2^56812909 is an apocalyptic number.

It is an amenable number.

56812909 is a deficient number, since it is larger than the sum of its proper divisors (1).

56812909 is an equidigital number, since it uses as much as digits as its factorization.

56812909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 56812909 is about 7537.4338471392. The cubic root of 56812909 is about 384.4285873159.

The spelling of 56812909 in words is "fifty-six million, eight hundred twelve thousand, nine hundred nine".