31231122311231 has 4 divisors (see below), whose sum is σ = 32588997194352. Its totient is φ = 29873247428112.

The previous prime is 31231122311201. The next prime is 31231122311261. The reversal of 31231122311231 is 13211322113213.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31231122311201) and next prime (31231122311261).

It is a cyclic number.

It is not a de Polignac number, because 31231122311231 - 2¹⁰ = 31231122310207 is a prime.

It is a super-2 number, since 2×31231122311231² (a number of 28 digits) contains 22 as substring.

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 31231122311231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231122311201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678937441526 + ... + 678937441571.

It is an arithmetic number, because the mean of its divisors is an integer number (8147249298588).

Almost surely, 2^{31231122311231} is an apocalyptic number.

31231122311231 is a deficient number, since it is larger than the sum of its proper divisors (1357874883121).

31231122311231 is a wasteful number, since it uses less digits than its factorization.

31231122311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357874883120.

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

Adding to 31231122311231 its reverse (13211322113213), we get a palindrome (44442444424444).

The spelling of 31231122311231 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-two million, three hundred eleven thousand, two hundred thirty-one".