257716631 has 2 divisors, whose sum is σ = 257716632. Its totient is φ = 257716630.

The previous prime is 257716619. The next prime is 257716663. The reversal of 257716631 is 136617752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257716631 is a prime.

It is a super-2 number, since 2×257716631² = 132835723787980322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257716691) 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, 128858315 + 128858316.

It is an arithmetic number, because the mean of its divisors is an integer number (128858316).

Almost surely, 2^257716631 is an apocalyptic number.

257716631 is a deficient number, since it is larger than the sum of its proper divisors (1).

257716631 is an equidigital number, since it uses as much as digits as its factorization.

257716631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 257716631 is about 16053.5550891384. Note that the first 3 decimals coincide. The cubic root of 257716631 is about 636.3765216074.

The spelling of 257716631 in words is "two hundred fifty-seven million, seven hundred sixteen thousand, six hundred thirty-one".