251895 has 16 divisors (see below), whose sum is σ = 460800. Its totient is φ = 115104.

The previous prime is 251893. The next prime is 251897. The reversal of 251895 is 598152.

It is an interprime number because it is at equal distance from previous prime (251893) and next prime (251897).

It is not a de Polignac number, because 251895 - 2¹ = 251893 is a prime.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095 + ... + 1304.

It is an arithmetic number, because the mean of its divisors is an integer number (28800).

2²⁵¹⁸⁹⁵ is an apocalyptic number.

251895 is a deficient number, since it is larger than the sum of its proper divisors (208905).

251895 is a wasteful number, since it uses less digits than its factorization.

251895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414.

The product of its digits is 3600, while the sum is 30.

The square root of 251895 is about 501.8914225208. The cubic root of 251895 is about 63.1548220362.

The spelling of 251895 in words is "two hundred fifty-one thousand, eight hundred ninety-five".