31231213213 has 8 divisors (see below), whose sum is σ = 33123376440. Its totient is φ = 29345164800.

The previous prime is 31231213177. The next prime is 31231213217.

31231213213 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 5842614969 + 25388598244 = 76437^2 + 159338^2 .

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 31231213213 - 2¹³ = 31231205021 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 (31231213217) 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, 1518178 + ... + 1538611.

It is an arithmetic number, because the mean of its divisors is an integer number (4140422055).

Almost surely, 2^31231213213 is an apocalyptic number.

It is an amenable number.

31231213213 is a deficient number, since it is larger than the sum of its proper divisors (1892163227).

31231213213 is a wasteful number, since it uses less digits than its factorization.

31231213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057407.

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

The spelling of 31231213213 in words is "thirty-one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred thirteen".