31231231213231 has 16 divisors (see below), whose sum is σ = 36228367853568. Its totient is φ = 26368661289600.

The previous prime is 31231231213223. The next prime is 31231231213283. The reversal of 31231231213231 is 13231213213213.

It is not a de Polignac number, because 31231231213231 - 2³ = 31231231213223 is a prime.

It is a super-2 number, since 2×31231231213231² (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 31231231213231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231231213531) 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, 27937530 + ... + 29033911.

It is an arithmetic number, because the mean of its divisors is an integer number (2264272990848).

Almost surely, 2^{31231231213231} is an apocalyptic number.

31231231213231 is a deficient number, since it is larger than the sum of its proper divisors (4997136640337).

31231231213231 is a wasteful number, since it uses less digits than its factorization.

31231231213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56972622.

The product of its digits is 3888, while the sum is 28.

Adding to 31231231213231 its reverse (13231213213213), we get a palindrome (44462444426444).

The spelling of 31231231213231 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-one".