57131887 has 2 divisors, whose sum is σ = 57131888. Its totient is φ = 57131886.

The previous prime is 57131863. The next prime is 57131897. The reversal of 57131887 is 78813175.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57131887 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 (57131897) 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, 28565943 + 28565944.

It is an arithmetic number, because the mean of its divisors is an integer number (28565944).

Almost surely, 2^57131887 is an apocalyptic number.

57131887 is a deficient number, since it is larger than the sum of its proper divisors (1).

57131887 is an equidigital number, since it uses as much as digits as its factorization.

57131887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 40.

The square root of 57131887 is about 7558.5638186100. The cubic root of 57131887 is about 385.1467074553.

The spelling of 57131887 in words is "fifty-seven million, one hundred thirty-one thousand, eight hundred eighty-seven".