251313523 has 4 divisors (see below), whose sum is σ = 254756248. Its totient is φ = 247870800.

The previous prime is 251313487. The next prime is 251313527. The reversal of 251313523 is 325313152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251313523 - 2⁹ = 251313011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251313527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1721253 + ... + 1721398.

It is an arithmetic number, because the mean of its divisors is an integer number (63689062).

Almost surely, 2^251313523 is an apocalyptic number.

251313523 is a deficient number, since it is larger than the sum of its proper divisors (3442725).

251313523 is an equidigital number, since it uses as much as digits as its factorization.

251313523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442724.

The product of its digits is 2700, while the sum is 25.

The square root of 251313523 is about 15852.8711279692. The cubic root of 251313523 is about 631.0618884900.

Adding to 251313523 its reverse (325313152), we get a palindrome (576626675).

The spelling of 251313523 in words is "two hundred fifty-one million, three hundred thirteen thousand, five hundred twenty-three".