257120531 has 2 divisors, whose sum is σ = 257120532. Its totient is φ = 257120530.

The previous prime is 257120477. The next prime is 257120557. The reversal of 257120531 is 135021752.

It is an a-pointer prime, because the next prime (257120557) can be obtained adding 257120531 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257120531 - 2¹⁸ = 256858387 is a prime.

It is a super-2 number, since 2×257120531² = 132221934923443922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257120531.

It is not a weakly prime, because it can be changed into another prime (257120581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128560265 + 128560266.

It is an arithmetic number, because the mean of its divisors is an integer number (128560266).

Almost surely, 2^257120531 is an apocalyptic number.

257120531 is a deficient number, since it is larger than the sum of its proper divisors (1).

257120531 is an equidigital number, since it uses as much as digits as its factorization.

257120531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 257120531 is about 16034.9783598233. The cubic root of 257120531 is about 635.8854953532.

The spelling of 257120531 in words is "two hundred fifty-seven million, one hundred twenty thousand, five hundred thirty-one".