31122113213231 has 16 divisors (see below), whose sum is σ = 32858317799424. Its totient is φ = 29419655215104.

The previous prime is 31122113213221. The next prime is 31122113213239. The reversal of 31122113213231 is 13231231122113.

It is a cyclic number.

It is not a de Polignac number, because 31122113213231 - 2¹⁸ = 31122112951087 is a prime.

It is a super-3 number, since 3×31122113213231³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31122113213231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122113213239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19978115 + ... + 21479508.

It is an arithmetic number, because the mean of its divisors is an integer number (2053644862464).

Almost surely, 2^{31122113213231} is an apocalyptic number.

31122113213231 is a deficient number, since it is larger than the sum of its proper divisors (1736204586193).

31122113213231 is a wasteful number, since it uses less digits than its factorization.

31122113213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41458030.

The product of its digits is 1296, while the sum is 26.

Adding to 31122113213231 its reverse (13231231122113), we get a palindrome (44353344335344).

The spelling of 31122113213231 in words is "thirty-one trillion, one hundred twenty-two billion, one hundred thirteen million, two hundred thirteen thousand, two hundred thirty-one".