31313313213 has 24 divisors (see below), whose sum is σ = 51668296128. Its totient is φ = 16516910592.

The previous prime is 31313313203. The next prime is 31313313253. The reversal of 31313313213 is 31231331313.

It is not a de Polignac number, because 31313313213 - 2¹⁶ = 31313247677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313313203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4408020 + ... + 4415117.

It is an arithmetic number, because the mean of its divisors is an integer number (2152845672).

Almost surely, 2^31313313213 is an apocalyptic number.

It is an amenable number.

31313313213 is a deficient number, since it is larger than the sum of its proper divisors (20354982915).

31313313213 is a wasteful number, since it uses less digits than its factorization.

31313313213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8823173 (or 8823160 counting only the distinct ones).

The product of its digits is 1458, while the sum is 24.

Adding to 31313313213 its reverse (31231331313), we get a palindrome (62544644526).

The spelling of 31313313213 in words is "thirty-one billion, three hundred thirteen million, three hundred thirteen thousand, two hundred thirteen".