251896 has 24 divisors (see below), whose sum is σ = 506520. Its totient is φ = 117216.

The previous prime is 251893. The next prime is 251897. The reversal of 251896 is 698152.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6790 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (21105).

251896 is a Friedman number, since it can be written as 851*296, using all its digits and the basic arithmetic operations.

It is a vampire number, since it can be written as 296 ⋅ 851 (with its own digits).

2²⁵¹⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

251896 is an abundant number, since it is smaller than the sum of its proper divisors (254624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251896 is a wasteful number, since it uses less digits than its factorization.

251896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 62 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 251896 is about 501.8924187513. The cubic root of 251896 is about 63.1549056090.

The spelling of 251896 in words is "two hundred fifty-one thousand, eight hundred ninety-six".