257325779 has 2 divisors, whose sum is σ = 257325780. Its totient is φ = 257325778.

The previous prime is 257325767. The next prime is 257325781. The reversal of 257325779 is 977523752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257325779 - 2⁴ = 257325763 is a prime.

It is a Sophie Germain prime.

Together with 257325781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257325179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128662889 + 128662890.

It is an arithmetic number, because the mean of its divisors is an integer number (128662890).

Almost surely, 2^257325779 is an apocalyptic number.

257325779 is a deficient number, since it is larger than the sum of its proper divisors (1).

257325779 is an equidigital number, since it uses as much as digits as its factorization.

257325779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 926100, while the sum is 47.

The square root of 257325779 is about 16041.3770917587. The cubic root of 257325779 is about 636.0546501501.

The spelling of 257325779 in words is "two hundred fifty-seven million, three hundred twenty-five thousand, seven hundred seventy-nine".