56909813 has 2 divisors, whose sum is σ = 56909814. Its totient is φ = 56909812.

The previous prime is 56909791. The next prime is 56909819. The reversal of 56909813 is 31890965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52678564 + 4231249 = 7258^2 + 2057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56909813 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 (56909819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28454906 + 28454907.

It is an arithmetic number, because the mean of its divisors is an integer number (28454907).

Almost surely, 2^56909813 is an apocalyptic number.

It is an amenable number.

56909813 is a deficient number, since it is larger than the sum of its proper divisors (1).

56909813 is an equidigital number, since it uses as much as digits as its factorization.

56909813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 56909813 is about 7543.8592908405. The cubic root of 56909813 is about 384.6470324327.

The spelling of 56909813 in words is "fifty-six million, nine hundred nine thousand, eight hundred thirteen".