12311315551 has 4 divisors (see below), whose sum is σ = 12313778400. Its totient is φ = 12308852704.

The previous prime is 12311315531. The next prime is 12311315557. The reversal of 12311315551 is 15551311321.

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 12311315551 - 2²⁹ = 11774444639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311315557) 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, 1223911 + ... + 1233928.

It is an arithmetic number, because the mean of its divisors is an integer number (3078444600).

Almost surely, 2^12311315551 is an apocalyptic number.

12311315551 is a deficient number, since it is larger than the sum of its proper divisors (2462849).

12311315551 is an equidigital number, since it uses as much as digits as its factorization.

12311315551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462848.

The product of its digits is 2250, while the sum is 28.

Adding to 12311315551 its reverse (15551311321), we get a palindrome (27862626872).

The spelling of 12311315551 in words is "twelve billion, three hundred eleven million, three hundred fifteen thousand, five hundred fifty-one".