257307613 has 4 divisors (see below), whose sum is σ = 257457148. Its totient is φ = 257158080.

The previous prime is 257307607. The next prime is 257307623. The reversal of 257307613 is 316703752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69672409 + 187635204 = 8347^2 + 13698^2 .

It is a cyclic number.

It is not a de Polignac number, because 257307613 - 2⁵ = 257307581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257307623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72156 + ... + 75637.

It is an arithmetic number, because the mean of its divisors is an integer number (64364287).

Almost surely, 2^257307613 is an apocalyptic number.

It is an amenable number.

257307613 is a deficient number, since it is larger than the sum of its proper divisors (149535).

257307613 is a wasteful number, since it uses less digits than its factorization.

257307613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149534.

The product of its (nonzero) digits is 26460, while the sum is 34.

The square root of 257307613 is about 16040.8108585570. The cubic root of 257307613 is about 636.0396823005.

The spelling of 257307613 in words is "two hundred fifty-seven million, three hundred seven thousand, six hundred thirteen".