257870567 has 2 divisors, whose sum is σ = 257870568. Its totient is φ = 257870566.

The previous prime is 257870563. The next prime is 257870573. The reversal of 257870567 is 765078752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257870567 - 2² = 257870563 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257870563) 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, 128935283 + 128935284.

It is an arithmetic number, because the mean of its divisors is an integer number (128935284).

Almost surely, 2^257870567 is an apocalyptic number.

257870567 is a deficient number, since it is larger than the sum of its proper divisors (1).

257870567 is an equidigital number, since it uses as much as digits as its factorization.

257870567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 823200, while the sum is 47.

The square root of 257870567 is about 16058.3488254552. The cubic root of 257870567 is about 636.5032004820.

The spelling of 257870567 in words is "two hundred fifty-seven million, eight hundred seventy thousand, five hundred sixty-seven".