257870531 has 2 divisors, whose sum is σ = 257870532. Its totient is φ = 257870530.

The previous prime is 257870507. The next prime is 257870537. The reversal of 257870531 is 135078752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257870531 - 2²⁶ = 190761667 is a prime.

It is a super-2 number, since 2×257870531² = 132994421516443922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257870537) 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, 128935265 + 128935266.

It is an arithmetic number, because the mean of its divisors is an integer number (128935266).

Almost surely, 2^257870531 is an apocalyptic number.

257870531 is a deficient number, since it is larger than the sum of its proper divisors (1).

257870531 is an equidigital number, since it uses as much as digits as its factorization.

257870531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 257870531 is about 16058.3477045430. The cubic root of 257870531 is about 636.5031708624.

The spelling of 257870531 in words is "two hundred fifty-seven million, eight hundred seventy thousand, five hundred thirty-one".