31231311223 has 16 divisors (see below), whose sum is σ = 36011303680. Its totient is φ = 26531971200.

The previous prime is 31231311179. The next prime is 31231311239. The reversal of 31231311223 is 32211313213.

It is a de Polignac number, because none of the positive numbers 2^k-31231311223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31231311194 and 31231311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231311253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312088 + ... + 399826.

It is an arithmetic number, because the mean of its divisors is an integer number (2250706480).

Almost surely, 2^31231311223 is an apocalyptic number.

31231311223 is a deficient number, since it is larger than the sum of its proper divisors (4779992457).

31231311223 is a wasteful number, since it uses less digits than its factorization.

31231311223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88198.

The product of its digits is 648, while the sum is 22.

Adding to 31231311223 its reverse (32211313213), we get a palindrome (63442624436).

The spelling of 31231311223 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, two hundred twenty-three".