31312112211331 has 4 divisors (see below), whose sum is σ = 35785271098672. Its totient is φ = 26838953323992.

The previous prime is 31312112211329. The next prime is 31312112211377. The reversal of 31312112211331 is 13311221121313.

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 31312112211331 - 2¹ = 31312112211329 is a prime.

It is a super-2 number, since 2×31312112211331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31312112211296 and 31312112211305.

It is not an unprimeable number, because it can be changed into a prime (31312112211031) 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, 2236579443660 + ... + 2236579443673.

It is an arithmetic number, because the mean of its divisors is an integer number (8946317774668).

Almost surely, 2^{31312112211331} is an apocalyptic number.

31312112211331 is a deficient number, since it is larger than the sum of its proper divisors (4473158887341).

31312112211331 is an equidigital number, since it uses as much as digits as its factorization.

31312112211331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473158887340.

The product of its digits is 648, while the sum is 25.

Adding to 31312112211331 its reverse (13311221121313), we get a palindrome (44623333332644).

The spelling of 31312112211331 in words is "thirty-one trillion, three hundred twelve billion, one hundred twelve million, two hundred eleven thousand, three hundred thirty-one".