251313312 has 48 divisors (see below), whose sum is σ = 698507712. Its totient is φ = 78842880.

The previous prime is 251313301. The next prime is 251313317. The reversal of 251313312 is 213313152.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (251313317) 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, 75364 + ... + 78627.

It is an arithmetic number, because the mean of its divisors is an integer number (14552244).

Almost surely, 2^251313312 is an apocalyptic number.

It is an amenable number.

251313312 is an abundant number, since it is smaller than the sum of its proper divisors (447194400).

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

251313312 is a wasteful number, since it uses less digits than its factorization.

251313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154021 (or 154013 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 251313312 is about 15852.8644730219. The cubic root of 251313312 is about 631.0617118792.

Adding to 251313312 its reverse (213313152), we get a palindrome (464626464).

The spelling of 251313312 in words is "two hundred fifty-one million, three hundred thirteen thousand, three hundred twelve".