257145 has 32 divisors (see below), whose sum is σ = 491520. Its totient is φ = 112320.

The previous prime is 257141. The next prime is 257161. The reversal of 257145 is 541752.

It is not a de Polignac number, because 257145 - 2² = 257141 is a prime.

It is a super-2 number, since 2×257145² = 132247102050, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 257145.

It is not an unprimeable number, because it can be changed into a prime (257141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3216 + ... + 3294.

It is an arithmetic number, because the mean of its divisors is an integer number (15360).

2²⁵⁷¹⁴⁵ is an apocalyptic number.

It is an amenable number.

257145 is a deficient number, since it is larger than the sum of its proper divisors (234375).

257145 is a wasteful number, since it uses less digits than its factorization.

257145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125.

The product of its digits is 1400, while the sum is 24.

The square root of 257145 is about 507.0946657183. The cubic root of 257145 is about 63.5905666164.

Adding to 257145 its reverse (541752), we get a palindrome (798897).

The spelling of 257145 in words is "two hundred fifty-seven thousand, one hundred forty-five".