257538697 has 4 divisors (see below), whose sum is σ = 277349380. Its totient is φ = 237728016.

The previous prime is 257538689. The next prime is 257538703. The reversal of 257538697 is 796835752.

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 53934336 + 203604361 = 7344^2 + 14269^2 .

It is a cyclic number.

It is not a de Polignac number, because 257538697 - 2³ = 257538689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257538397) 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, 9905322 + ... + 9905347.

It is an arithmetic number, because the mean of its divisors is an integer number (69337345).

Almost surely, 2^257538697 is an apocalyptic number.

It is an amenable number.

257538697 is a deficient number, since it is larger than the sum of its proper divisors (19810683).

257538697 is a wasteful number, since it uses less digits than its factorization.

257538697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19810682.

The product of its digits is 3175200, while the sum is 52.

The square root of 257538697 is about 16048.0122445118. The cubic root of 257538697 is about 636.2300311394.

The spelling of 257538697 in words is "two hundred fifty-seven million, five hundred thirty-eight thousand, six hundred ninety-seven".