251516868 has 24 divisors (see below), whose sum is σ = 612389568. Its totient is φ = 80193696.

The previous prime is 251516821. The next prime is 251516893. The reversal of 251516868 is 868615152.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455371 + ... + 455922.

It is an arithmetic number, because the mean of its divisors is an integer number (25516232).

Almost surely, 2^251516868 is an apocalyptic number.

It is an amenable number.

251516868 is an abundant number, since it is smaller than the sum of its proper divisors (360872700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251516868 is a wasteful number, since it uses less digits than its factorization.

251516868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911323 (or 911321 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 251516868 is about 15859.2833381588. The cubic root of 251516868 is about 631.2320460469.

The spelling of 251516868 in words is "two hundred fifty-one million, five hundred sixteen thousand, eight hundred sixty-eight".