13312431243 has 20 divisors (see below), whose sum is σ = 20423948160. Its totient is φ = 8635088592.

The previous prime is 13312431241. The next prime is 13312431287. The reversal of 13312431243 is 34213421331.

It is a happy number.

It is not a de Polignac number, because 13312431243 - 2¹ = 13312431241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13312431241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2217963 + ... + 2223956.

It is an arithmetic number, because the mean of its divisors is an integer number (1021197408).

Almost surely, 2^13312431243 is an apocalyptic number.

13312431243 is a deficient number, since it is larger than the sum of its proper divisors (7111516917).

13312431243 is an equidigital number, since it uses as much as digits as its factorization.

13312431243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441968 (or 4441959 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 13312431243 its reverse (34213421331), we get a palindrome (47525852574).

The spelling of 13312431243 in words is "thirteen billion, three hundred twelve million, four hundred thirty-one thousand, two hundred forty-three".