57115811 has 2 divisors, whose sum is σ = 57115812. Its totient is φ = 57115810.

The previous prime is 57115789. The next prime is 57115813. The reversal of 57115811 is 11851175.

It is a happy number.

57115811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57115811 - 2¹⁰ = 57114787 is a prime.

Together with 57115813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57115813) 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, 28557905 + 28557906.

It is an arithmetic number, because the mean of its divisors is an integer number (28557906).

Almost surely, 2^57115811 is an apocalyptic number.

57115811 is a deficient number, since it is larger than the sum of its proper divisors (1).

57115811 is an equidigital number, since it uses as much as digits as its factorization.

57115811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1400, while the sum is 29.

The square root of 57115811 is about 7557.5003142574. The cubic root of 57115811 is about 385.1105793569.

Adding to 57115811 its reverse (11851175), we get a palindrome (68966986).

The spelling of 57115811 in words is "fifty-seven million, one hundred fifteen thousand, eight hundred eleven".