251265225 has 24 divisors (see below), whose sum is σ = 433490112. Its totient is φ = 128180800.

The previous prime is 251265221. The next prime is 251265227. The reversal of 251265225 is 522562152.

It is not a de Polignac number, because 251265225 - 2² = 251265221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251265192 and 251265201.

It is not an unprimeable number, because it can be changed into a prime (251265221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71106 + ... + 74555.

It is an arithmetic number, because the mean of its divisors is an integer number (18062088).

Almost surely, 2^251265225 is an apocalyptic number.

251265225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251265225 is a deficient number, since it is larger than the sum of its proper divisors (182224887).

251265225 is a wasteful number, since it uses less digits than its factorization.

251265225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145697 (or 145692 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 251265225 is about 15851.3477344988. The cubic root of 251265225 is about 631.0214596007.

The spelling of 251265225 in words is "two hundred fifty-one million, two hundred sixty-five thousand, two hundred twenty-five".