251252121 has 4 divisors (see below), whose sum is σ = 335002832. Its totient is φ = 167501412.

The previous prime is 251252119. The next prime is 251252167. The reversal of 251252121 is 121252152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 251252121 - 2¹ = 251252119 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251252191) 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, 41875351 + ... + 41875356.

It is an arithmetic number, because the mean of its divisors is an integer number (83750708).

Almost surely, 2^251252121 is an apocalyptic number.

It is an amenable number.

251252121 is a deficient number, since it is larger than the sum of its proper divisors (83750711).

251252121 is an equidigital number, since it uses as much as digits as its factorization.

251252121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83750710.

The product of its digits is 400, while the sum is 21.

The square root of 251252121 is about 15850.9343888617. The cubic root of 251252121 is about 631.0104897196.

The spelling of 251252121 in words is "two hundred fifty-one million, two hundred fifty-two thousand, one hundred twenty-one".