251205225 has 12 divisors (see below), whose sum is σ = 415326096. Its totient is φ = 133976080.

The previous prime is 251205217. The next prime is 251205257. The reversal of 251205225 is 522502152.

It is not a de Polignac number, because 251205225 - 2³ = 251205217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251205195 and 251205204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1674627 + ... + 1674776.

It is an arithmetic number, because the mean of its divisors is an integer number (34610508).

Almost surely, 2^251205225 is an apocalyptic number.

251205225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251205225 is a deficient number, since it is larger than the sum of its proper divisors (164120871).

251205225 is a wasteful number, since it uses less digits than its factorization.

251205225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349416 (or 3349411 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 251205225 is about 15849.4550379500. The cubic root of 251205225 is about 630.9712280819.

Adding to 251205225 its reverse (522502152), we get a palindrome (773707377).

The spelling of 251205225 in words is "two hundred fifty-one million, two hundred five thousand, two hundred twenty-five".