57116309 has 2 divisors, whose sum is σ = 57116310. Its totient is φ = 57116308.

The previous prime is 57116273. The next prime is 57116333. The reversal of 57116309 is 90361175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32890225 + 24226084 = 5735^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 57116309 - 2²⁰ = 56067733 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57116359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28558154 + 28558155.

It is an arithmetic number, because the mean of its divisors is an integer number (28558155).

Almost surely, 2^57116309 is an apocalyptic number.

It is an amenable number.

57116309 is a deficient number, since it is larger than the sum of its proper divisors (1).

57116309 is an equidigital number, since it uses as much as digits as its factorization.

57116309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 57116309 is about 7557.5332615874. The cubic root of 57116309 is about 385.1116986297. Note that the first 3 decimals are identical.

The spelling of 57116309 in words is "fifty-seven million, one hundred sixteen thousand, three hundred nine".