257506339 has 2 divisors, whose sum is σ = 257506340. Its totient is φ = 257506338.

The previous prime is 257506313. The next prime is 257506349. The reversal of 257506339 is 933605752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257506339 - 2⁷ = 257506211 is a prime.

It is not a weakly prime, because it can be changed into another prime (257506309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128753169 + 128753170.

It is an arithmetic number, because the mean of its divisors is an integer number (128753170).

Almost surely, 2^257506339 is an apocalyptic number.

257506339 is a deficient number, since it is larger than the sum of its proper divisors (1).

257506339 is an equidigital number, since it uses as much as digits as its factorization.

257506339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 170100, while the sum is 40.

The square root of 257506339 is about 16047.0040506008. The cubic root of 257506339 is about 636.2033840195.

The spelling of 257506339 in words is "two hundred fifty-seven million, five hundred six thousand, three hundred thirty-nine".