257118923 has 4 divisors (see below), whose sum is σ = 257249928. Its totient is φ = 256987920.

The previous prime is 257118919. The next prime is 257118941. The reversal of 257118923 is 329811752.

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

It is a cyclic number.

It is not a de Polignac number, because 257118923 - 2² = 257118919 is a prime.

It is a super-2 number, since 2×257118923² = 132220281129359858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257118943) 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, 62513 + ... + 66498.

It is an arithmetic number, because the mean of its divisors is an integer number (64312482).

Almost surely, 2^257118923 is an apocalyptic number.

257118923 is a deficient number, since it is larger than the sum of its proper divisors (131005).

257118923 is a wasteful number, since it uses less digits than its factorization.

257118923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131004.

The product of its digits is 30240, while the sum is 38.

The square root of 257118923 is about 16034.9282193591. The cubic root of 257118923 is about 635.8841697673.

The spelling of 257118923 in words is "two hundred fifty-seven million, one hundred eighteen thousand, nine hundred twenty-three".