257851 has 6 divisors (see below), whose sum is σ = 283556. Its totient is φ = 234300.

The previous prime is 257837. The next prime is 257857. The reversal of 257851 is 158752.

257851 = T₂₁₁ + T₂₁₂ + ... + T₂₂₁.

It is not a de Polignac number, because 257851 - 2⁹ = 257339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 945 + ... + 1186.

2²⁵⁷⁸⁵¹ is an apocalyptic number.

257851 is a deficient number, since it is larger than the sum of its proper divisors (25705).

257851 is a wasteful number, since it uses less digits than its factorization.

257851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153 (or 2142 counting only the distinct ones).

The product of its digits is 2800, while the sum is 28.

The square root of 257851 is about 507.7903110537. The cubic root of 257851 is about 63.6487100967.

Subtracting from 257851 its reverse (158752), we obtain a palindrome (99099).

The spelling of 257851 in words is "two hundred fifty-seven thousand, eight hundred fifty-one".