251055121 has 4 divisors (see below), whose sum is σ = 251087472. Its totient is φ = 251022772.

The previous prime is 251055107. The next prime is 251055137. The reversal of 251055121 is 121550152.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 251055121 - 2²⁷ = 116837393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251055092 and 251055101.

It is not an unprimeable number, because it can be changed into a prime (251055191) 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, 3210 + ... + 22636.

It is an arithmetic number, because the mean of its divisors is an integer number (62771868).

Almost surely, 2^251055121 is an apocalyptic number.

It is an amenable number.

251055121 is a deficient number, since it is larger than the sum of its proper divisors (32351).

251055121 is a wasteful number, since it uses less digits than its factorization.

251055121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32350.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 251055121 is about 15844.7190255934. The cubic root of 251055121 is about 630.8455271722.

The spelling of 251055121 in words is "two hundred fifty-one million, fifty-five thousand, one hundred twenty-one".