257312161 has 4 divisors (see below), whose sum is σ = 257345712. Its totient is φ = 257278612.

The previous prime is 257312147. The next prime is 257312177. The reversal of 257312161 is 161213752.

It is a happy number.

257312161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257312161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257312101) 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, 1026 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (64336428).

Almost surely, 2^257312161 is an apocalyptic number.

It is an amenable number.

257312161 is a deficient number, since it is larger than the sum of its proper divisors (33551).

257312161 is a wasteful number, since it uses less digits than its factorization.

257312161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33550.

The product of its digits is 2520, while the sum is 28.

The square root of 257312161 is about 16040.9526213377. The cubic root of 257312161 is about 636.0434296847.

The spelling of 257312161 in words is "two hundred fifty-seven million, three hundred twelve thousand, one hundred sixty-one".