251516260 has 24 divisors (see below), whose sum is σ = 533417976. Its totient is φ = 99609600.

The previous prime is 251516231. The next prime is 251516267. The reversal of 251516260 is 62615152.

It can be written as a sum of positive squares in 4 ways, for example, as 13307904 + 238208356 = 3648^2 + 15434^2 .

It is not an unprimeable number, because it can be changed into a prime (251516267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60237 + ... + 64276.

It is an arithmetic number, because the mean of its divisors is an integer number (22225749).

Almost surely, 2^251516260 is an apocalyptic number.

251516260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251516260 is an abundant number, since it is smaller than the sum of its proper divisors (281901716).

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

251516260 is a wasteful number, since it uses less digits than its factorization.

251516260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124623 (or 124621 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 251516260 is about 15859.2641695635. The cubic root of 251516260 is about 631.2315374138.

The spelling of 251516260 in words is "two hundred fifty-one million, five hundred sixteen thousand, two hundred sixty".