31211202013 has 2 divisors, whose sum is σ = 31211202014. Its totient is φ = 31211202012.

The previous prime is 31211201999. The next prime is 31211202067. The reversal of 31211202013 is 31020211213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29992005124 + 1219196889 = 173182^2 + 34917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31211202013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211202083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605601006 + 15605601007.

It is an arithmetic number, because the mean of its divisors is an integer number (15605601007).

Almost surely, 2^31211202013 is an apocalyptic number.

It is an amenable number.

31211202013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211202013 is an equidigital number, since it uses as much as digits as its factorization.

31211202013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31211202013 its reverse (31020211213), we get a palindrome (62231413226).

The spelling of 31211202013 in words is "thirty-one billion, two hundred eleven million, two hundred two thousand, thirteen".