257443913 has 2 divisors, whose sum is σ = 257443914. Its totient is φ = 257443912.

The previous prime is 257443889. The next prime is 257443919. The reversal of 257443913 is 319344752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239228089 + 18215824 = 15467^2 + 4268^2 .

It is a cyclic number.

It is not a de Polignac number, because 257443913 - 2¹² = 257439817 is a prime.

It is not a weakly prime, because it can be changed into another prime (257443919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128721956 + 128721957.

It is an arithmetic number, because the mean of its divisors is an integer number (128721957).

Almost surely, 2^257443913 is an apocalyptic number.

It is an amenable number.

257443913 is a deficient number, since it is larger than the sum of its proper divisors (1).

257443913 is an equidigital number, since it uses as much as digits as its factorization.

257443913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 257443913 is about 16045.0588344200. The cubic root of 257443913 is about 636.1519693082.

The spelling of 257443913 in words is "two hundred fifty-seven million, four hundred forty-three thousand, nine hundred thirteen".