257890231 has 2 divisors, whose sum is σ = 257890232. Its totient is φ = 257890230.

The previous prime is 257890229. The next prime is 257890253. The reversal of 257890231 is 132098752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257890231 - 2¹ = 257890229 is a prime.

It is a super-2 number, since 2×257890231² = 133014742490466722, which contains 22 as substring.

Together with 257890229, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257890291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128945115 + 128945116.

It is an arithmetic number, because the mean of its divisors is an integer number (128945116).

Almost surely, 2^257890231 is an apocalyptic number.

257890231 is a deficient number, since it is larger than the sum of its proper divisors (1).

257890231 is an equidigital number, since it uses as much as digits as its factorization.

257890231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 257890231 is about 16058.9610809666. The cubic root of 257890231 is about 636.5193789871.

It can be divided in two parts, 257890 and 231, that added together give a triangular number (258121 = T₇₁₈).

The spelling of 257890231 in words is "two hundred fifty-seven million, eight hundred ninety thousand, two hundred thirty-one".