251975 has 6 divisors (see below), whose sum is σ = 312480. Its totient is φ = 201560.

The previous prime is 251971. The next prime is 251983. The reversal of 251975 is 579152.

It is not a de Polignac number, because 251975 - 2² = 251971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251971) 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, 5015 + ... + 5064.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2²⁵¹⁹⁷⁵ is an apocalyptic number.

251975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

251975 is a deficient number, since it is larger than the sum of its proper divisors (60505).

251975 is a wasteful number, since it uses less digits than its factorization.

251975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10089 (or 10084 counting only the distinct ones).

The product of its digits is 3150, while the sum is 29.

The square root of 251975 is about 501.9711147068. The cubic root of 251975 is about 63.1615071642.

Adding to 251975 its sum of digits (29), we get a square (252004 = 502²).

The spelling of 251975 in words is "two hundred fifty-one thousand, nine hundred seventy-five".