251201315523 has 8 divisors (see below), whose sum is σ = 334962193600. Its totient is φ = 167453990568.

The previous prime is 251201315513. The next prime is 251201315531. The reversal of 251201315523 is 325513102152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251201315523 - 2¹⁸ = 251201053379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251201315513) 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, 3344953 + ... + 3419226.

It is an arithmetic number, because the mean of its divisors is an integer number (41870274200).

Almost surely, 2^251201315523 is an apocalyptic number.

251201315523 is a deficient number, since it is larger than the sum of its proper divisors (83760878077).

251201315523 is a wasteful number, since it uses less digits than its factorization.

251201315523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776561.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 251201315523 its reverse (325513102152), we get a palindrome (576714417675).

The spelling of 251201315523 in words is "two hundred fifty-one billion, two hundred one million, three hundred fifteen thousand, five hundred twenty-three".