257070791 has 2 divisors, whose sum is σ = 257070792. Its totient is φ = 257070790.

The previous prime is 257070769. The next prime is 257070809. The reversal of 257070791 is 197070752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257070791 - 2²² = 252876487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257070721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128535395 + 128535396.

It is an arithmetic number, because the mean of its divisors is an integer number (128535396).

Almost surely, 2^257070791 is an apocalyptic number.

257070791 is a deficient number, since it is larger than the sum of its proper divisors (1).

257070791 is an equidigital number, since it uses as much as digits as its factorization.

257070791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 257070791 is about 16033.4273004869. The cubic root of 257070791 is about 635.8444886650.

The spelling of 257070791 in words is "two hundred fifty-seven million, seventy thousand, seven hundred ninety-one".