257031139 has 2 divisors, whose sum is σ = 257031140. Its totient is φ = 257031138.

The previous prime is 257031133. The next prime is 257031149. The reversal of 257031139 is 931130752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257031139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257031139.

It is not a weakly prime, because it can be changed into another prime (257031133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128515569 + 128515570.

It is an arithmetic number, because the mean of its divisors is an integer number (128515570).

Almost surely, 2^257031139 is an apocalyptic number.

257031139 is a deficient number, since it is larger than the sum of its proper divisors (1).

257031139 is an equidigital number, since it uses as much as digits as its factorization.

257031139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 257031139 is about 16032.1907111910. The cubic root of 257031139 is about 635.8117949441.

The spelling of 257031139 in words is "two hundred fifty-seven million, thirty-one thousand, one hundred thirty-nine".