31213113013 has 8 divisors (see below), whose sum is σ = 32110791768. Its totient is φ = 30318280704.

The previous prime is 31213112993. The next prime is 31213113073. The reversal of 31213113013 is 31031131213.

It can be written as a sum of positive squares in 4 ways, for example, as 20448428004 + 10764685009 = 142998^2 + 103753^2 .

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

It is not a de Polignac number, because 31213113013 - 2⁵ = 31213112981 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 (31213113073) 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, 689356 + ... + 733237.

It is an arithmetic number, because the mean of its divisors is an integer number (4013848971).

Almost surely, 2^31213113013 is an apocalyptic number.

It is an amenable number.

31213113013 is a deficient number, since it is larger than the sum of its proper divisors (897678755).

31213113013 is a wasteful number, since it uses less digits than its factorization.

31213113013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423223.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31213113013 its reverse (31031131213), we get a palindrome (62244244226).

The spelling of 31213113013 in words is "thirty-one billion, two hundred thirteen million, one hundred thirteen thousand, thirteen".