257813971 has 2 divisors, whose sum is σ = 257813972. Its totient is φ = 257813970.

The previous prime is 257813957. The next prime is 257813989. The reversal of 257813971 is 179318752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257813971 is a prime.

It is not a weakly prime, because it can be changed into another prime (257813951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128906985 + 128906986.

It is an arithmetic number, because the mean of its divisors is an integer number (128906986).

Almost surely, 2^257813971 is an apocalyptic number.

257813971 is a deficient number, since it is larger than the sum of its proper divisors (1).

257813971 is an equidigital number, since it uses as much as digits as its factorization.

257813971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 257813971 is about 16056.5865301439. The cubic root of 257813971 is about 636.4566316791.

The spelling of 257813971 in words is "two hundred fifty-seven million, eight hundred thirteen thousand, nine hundred seventy-one".