57556139 has 2 divisors, whose sum is σ = 57556140. Its totient is φ = 57556138.

The previous prime is 57556133. The next prime is 57556141. The reversal of 57556139 is 93165575.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57556139 - 2¹² = 57552043 is a prime.

Together with 57556141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 57556096 and 57556105.

It is not a weakly prime, because it can be changed into another prime (57556133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28778069 + 28778070.

It is an arithmetic number, because the mean of its divisors is an integer number (28778070).

Almost surely, 2^57556139 is an apocalyptic number.

57556139 is a deficient number, since it is larger than the sum of its proper divisors (1).

57556139 is an equidigital number, since it uses as much as digits as its factorization.

57556139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141750, while the sum is 41.

The square root of 57556139 is about 7586.5762370123. The cubic root of 57556139 is about 386.0977027236.

The spelling of 57556139 in words is "fifty-seven million, five hundred fifty-six thousand, one hundred thirty-nine".