31311311323 has 4 divisors (see below), whose sum is σ = 31381991928. Its totient is φ = 31240630720.

The previous prime is 31311311299. The next prime is 31311311357. The reversal of 31311311323 is 32311311313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32311311313 = 281 ⋅114986873.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311311323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311311294 and 31311311303.

It is not an unprimeable number, because it can be changed into a prime (31311311923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35339638 + ... + 35340523.

It is an arithmetic number, because the mean of its divisors is an integer number (7845497982).

Almost surely, 2^31311311323 is an apocalyptic number.

31311311323 is a deficient number, since it is larger than the sum of its proper divisors (70680605).

31311311323 is an equidigital number, since it uses as much as digits as its factorization.

31311311323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70680604.

The product of its digits is 486, while the sum is 22.

Adding to 31311311323 its reverse (32311311313), we get a palindrome (63622622636).

The spelling of 31311311323 in words is "thirty-one billion, three hundred eleven million, three hundred eleven thousand, three hundred twenty-three".