251442225 has 60 divisors (see below), whose sum is σ = 468664944. Its totient is φ = 133267680.

The previous prime is 251442203. The next prime is 251442259. The reversal of 251442225 is 522244152.

It is not a de Polignac number, because 251442225 - 2⁷ = 251442097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 459402 + ... + 459948.

Almost surely, 2^251442225 is an apocalyptic number.

251442225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251442225 is a deficient number, since it is larger than the sum of its proper divisors (217222719).

251442225 is a wasteful number, since it uses less digits than its factorization.

251442225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 782 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 251442225 is about 15856.9298730870. The cubic root of 251442225 is about 631.1695960069.

Adding to 251442225 its reverse (522244152), we get a palindrome (773686377).

The spelling of 251442225 in words is "two hundred fifty-one million, four hundred forty-two thousand, two hundred twenty-five".