257122161 has 16 divisors (see below), whose sum is σ = 403329600. Its totient is φ = 161331264.

The previous prime is 257122147. The next prime is 257122183. The reversal of 257122161 is 161221752.

It is not a de Polignac number, because 257122161 - 2⁶ = 257122097 is a prime.

It is a super-2 number, since 2×257122161² = 132223611354619842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (257122861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279631 + ... + 280548.

It is an arithmetic number, because the mean of its divisors is an integer number (25208100).

Almost surely, 2^257122161 is an apocalyptic number.

It is an amenable number.

257122161 is a deficient number, since it is larger than the sum of its proper divisors (146207439).

257122161 is a wasteful number, since it uses less digits than its factorization.

257122161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560205 (or 560199 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 257122161 is about 16035.0291861287. The cubic root of 257122161 is about 635.8868390695.

The spelling of 257122161 in words is "two hundred fifty-seven million, one hundred twenty-two thousand, one hundred sixty-one".