31231311222213 has 12 divisors (see below), whose sum is σ = 45111960735660. Its totient is φ = 20820843341376.

The previous prime is 31231311222193. The next prime is 31231311222239. The reversal of 31231311222213 is 31222211313213.

31231311222213 is a `hidden beast` number, since 3 + 1 + 2 + 313 + 1 + 122 + 221 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6997331691009 + 24233979531204 = 2645247^2 + 4922802^2 .

It is not a de Polignac number, because 31231311222213 - 2¹⁰ = 31231311221189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231311222263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5039695 + ... + 9373427.

It is an arithmetic number, because the mean of its divisors is an integer number (3759330061305).

Almost surely, 2^{31231311222213} is an apocalyptic number.

It is an amenable number.

31231311222213 is a deficient number, since it is larger than the sum of its proper divisors (13880649513447).

31231311222213 is a wasteful number, since it uses less digits than its factorization.

31231311222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134468 (or 5134465 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 31231311222213 its reverse (31222211313213), we get a palindrome (62453522535426).

The spelling of 31231311222213 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred eleven million, two hundred twenty-two thousand, two hundred thirteen".