251972251 has 6 divisors (see below), whose sum is σ = 253467260. Its totient is φ = 250486008.

The previous prime is 251972239. The next prime is 251972263. The reversal of 251972251 is 152279152.

251972251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251972239) and next prime (251972263).

It is not a de Polignac number, because 251972251 - 2²³ = 243583643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251972551) 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, 25720 + ... + 34138.

Almost surely, 2^251972251 is an apocalyptic number.

251972251 is a deficient number, since it is larger than the sum of its proper divisors (1495009).

251972251 is an frugal number, since it uses more digits than its factorization.

251972251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8765 (or 8592 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 251972251 is about 15873.6338309790. The cubic root of 251972251 is about 631.6127747000.

The spelling of 251972251 in words is "two hundred fifty-one million, nine hundred seventy-two thousand, two hundred fifty-one".