257395161 has 4 divisors (see below), whose sum is σ = 343193552. Its totient is φ = 171596772.

The previous prime is 257395123. The next prime is 257395183. The reversal of 257395161 is 161593752.

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.

It is not a de Polignac number, because 257395161 - 2⁹ = 257394649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257395961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42899191 + ... + 42899196.

It is an arithmetic number, because the mean of its divisors is an integer number (85798388).

Almost surely, 2^257395161 is an apocalyptic number.

It is an amenable number.

257395161 is a deficient number, since it is larger than the sum of its proper divisors (85798391).

257395161 is an equidigital number, since it uses as much as digits as its factorization.

257395161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85798390.

The product of its digits is 56700, while the sum is 39.

The square root of 257395161 is about 16043.5395408869. The cubic root of 257395161 is about 636.1118108670. Note that the first 3 decimals are identical.

The spelling of 257395161 in words is "two hundred fifty-seven million, three hundred ninety-five thousand, one hundred sixty-one".