251125605 has 12 divisors (see below), whose sum is σ = 435284460. Its totient is φ = 133933632.

The previous prime is 251125597. The next prime is 251125627. The reversal of 251125605 is 506521152.

251125605 is a `hidden beast` number, since 2 + 51 + 1 + 2 + 5 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 154181889 + 96943716 = 12417^2 + 9846^2 .

It is not a de Polignac number, because 251125605 - 2³ = 251125597 is a prime.

It is a congruent number.

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, 2790240 + ... + 2790329.

It is an arithmetic number, because the mean of its divisors is an integer number (36273705).

Almost surely, 2^251125605 is an apocalyptic number.

It is an amenable number.

251125605 is a deficient number, since it is larger than the sum of its proper divisors (184158855).

251125605 is a wasteful number, since it uses less digits than its factorization.

251125605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580580 (or 5580577 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 251125605 is about 15846.9430806071. The cubic root of 251125605 is about 630.9045585055.

Adding to 251125605 its reverse (506521152), we get a palindrome (757646757).

The spelling of 251125605 in words is "two hundred fifty-one million, one hundred twenty-five thousand, six hundred five".