251402251 has 4 divisors (see below), whose sum is σ = 251463232. Its totient is φ = 251341272.

The previous prime is 251402237. The next prime is 251402257. The reversal of 251402251 is 152204152.

251402251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251402251 - 2⁹ = 251401739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251402257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23820 + ... + 32713.

It is an arithmetic number, because the mean of its divisors is an integer number (62865808).

Almost surely, 2^251402251 is an apocalyptic number.

251402251 is a deficient number, since it is larger than the sum of its proper divisors (60981).

251402251 is an equidigital number, since it uses as much as digits as its factorization.

251402251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60980.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 251402251 is about 15855.6693646153. The cubic root of 251402251 is about 631.1361466919.

The spelling of 251402251 in words is "two hundred fifty-one million, four hundred two thousand, two hundred fifty-one".