31312222131331 has 4 divisors (see below), whose sum is σ = 31422866026072. Its totient is φ = 31201578236592.

The previous prime is 31312222131317. The next prime is 31312222131397. The reversal of 31312222131331 is 13313122221313.

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

It is a cyclic number.

It is not a de Polignac number, because 31312222131331 - 2¹¹ = 31312222129283 is a prime.

It is a super-2 number, since 2×31312222131331² (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 31312222131331.

It is not an unprimeable number, because it can be changed into a prime (31312222431331) 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, 55321946946 + ... + 55321947511.

It is an arithmetic number, because the mean of its divisors is an integer number (7855716506518).

Almost surely, 2^{31312222131331} is an apocalyptic number.

31312222131331 is a deficient number, since it is larger than the sum of its proper divisors (110643894741).

31312222131331 is a wasteful number, since it uses less digits than its factorization.

31312222131331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110643894740.

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

Adding to 31312222131331 its reverse (13313122221313), we get a palindrome (44625344352644).

The spelling of 31312222131331 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty-two million, one hundred thirty-one thousand, three hundred thirty-one".