251320225 has 24 divisors (see below), whose sum is σ = 338228352. Its totient is φ = 184142400.

The previous prime is 251320213. The next prime is 251320273. The reversal of 251320225 is 522023152.

It is not a de Polignac number, because 251320225 - 2¹⁷ = 251189153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251320196 and 251320205.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39624 + ... + 45526.

It is an arithmetic number, because the mean of its divisors is an integer number (14092848).

Almost surely, 2^251320225 is an apocalyptic number.

251320225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251320225 is a deficient number, since it is larger than the sum of its proper divisors (86908127).

251320225 is a wasteful number, since it uses less digits than its factorization.

251320225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057 (or 6052 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 251320225 is about 15853.0825078279. The cubic root of 251320225 is about 631.0674981353.

Adding to 251320225 its reverse (522023152), we get a palindrome (773343377).

The spelling of 251320225 in words is "two hundred fifty-one million, three hundred twenty thousand, two hundred twenty-five".