251120225 has 24 divisors (see below), whose sum is σ = 321973440. Its totient is φ = 194184000.

The previous prime is 251120197. The next prime is 251120227. The reversal of 251120225 is 522021152.

It is a happy number.

It is not a de Polignac number, because 251120225 - 2⁸ = 251119969 is a prime.

It is a super-2 number, since 2×251120225² = 126122734808101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251120197 and 251120206.

It is not an unprimeable number, because it can be changed into a prime (251120227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88580 + ... + 91370.

It is an arithmetic number, because the mean of its divisors is an integer number (13415560).

Almost surely, 2^251120225 is an apocalyptic number.

251120225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251120225 is a deficient number, since it is larger than the sum of its proper divisors (70853215).

251120225 is a wasteful number, since it uses less digits than its factorization.

251120225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921 (or 2916 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 251120225 is about 15846.7733308709. The cubic root of 251120225 is about 630.9000530699.

Adding to 251120225 its reverse (522021152), we get a palindrome (773141377).

The spelling of 251120225 in words is "two hundred fifty-one million, one hundred twenty thousand, two hundred twenty-five".