57116809 has 2 divisors, whose sum is σ = 57116810. Its totient is φ = 57116808.

The previous prime is 57116791. The next prime is 57116833. The reversal of 57116809 is 90861175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 23011209 = 5840^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 57116809 - 2⁵ = 57116777 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (57116009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28558404 + 28558405.

It is an arithmetic number, because the mean of its divisors is an integer number (28558405).

Almost surely, 2^57116809 is an apocalyptic number.

It is an amenable number.

57116809 is a deficient number, since it is larger than the sum of its proper divisors (1).

57116809 is an equidigital number, since it uses as much as digits as its factorization.

57116809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 57116809 is about 7557.5663410916. The cubic root of 57116809 is about 385.1128223909.

The spelling of 57116809 in words is "fifty-seven million, one hundred sixteen thousand, eight hundred nine".