257473913 has 2 divisors, whose sum is σ = 257473914. Its totient is φ = 257473912.

The previous prime is 257473907. The next prime is 257473949. The reversal of 257473913 is 319374752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255616144 + 1857769 = 15988^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 257473913 - 2⁴ = 257473897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (257473963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128736956 + 128736957.

It is an arithmetic number, because the mean of its divisors is an integer number (128736957).

Almost surely, 2^257473913 is an apocalyptic number.

It is an amenable number.

257473913 is a deficient number, since it is larger than the sum of its proper divisors (1).

257473913 is an equidigital number, since it uses as much as digits as its factorization.

257473913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 41.

The square root of 257473913 is about 16045.9936744347. The cubic root of 257473913 is about 636.1766786615.

It can be divided in two parts, 2574739 and 13, that added together give a palindrome (2574752).

The spelling of 257473913 in words is "two hundred fifty-seven million, four hundred seventy-three thousand, nine hundred thirteen".