31312313213 has 8 divisors (see below), whose sum is σ = 31351432320. Its totient is φ = 31273221760.

The previous prime is 31312313167. The next prime is 31312313267. The reversal of 31312313213 is 31231321313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31312313213 - 2²² = 31308118909 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 (31312313113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3023981 + ... + 3034317.

It is an arithmetic number, because the mean of its divisors is an integer number (3918929040).

Almost surely, 2^31312313213 is an apocalyptic number.

It is an amenable number.

31312313213 is a deficient number, since it is larger than the sum of its proper divisors (39119107).

31312313213 is a wasteful number, since it uses less digits than its factorization.

31312313213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13827.

The product of its digits is 972, while the sum is 23.

Adding to 31312313213 its reverse (31231321313), we get a palindrome (62543634526).

The spelling of 31312313213 in words is "thirty-one billion, three hundred twelve million, three hundred thirteen thousand, two hundred thirteen".