31311311013331 has 4 divisors (see below), whose sum is σ = 31311339932752. Its totient is φ = 31311282093912.

The previous prime is 31311311013181. The next prime is 31311311013341. The reversal of 31311311013331 is 13331011311313.

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 31311311013331 - 2²¹ = 31311308916179 is a prime.

It is a super-2 number, since 2×31311311013331² (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 = 31311311013296 and 31311311013305.

It is not an unprimeable number, because it can be changed into a prime (31311311013341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12769815 + ... + 15023008.

It is an arithmetic number, because the mean of its divisors is an integer number (7827834983188).

Almost surely, 2^{31311311013331} is an apocalyptic number.

31311311013331 is a deficient number, since it is larger than the sum of its proper divisors (28919421).

31311311013331 is a wasteful number, since it uses less digits than its factorization.

31311311013331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28919420.

The product of its (nonzero) digits is 729, while the sum is 25.

Adding to 31311311013331 its reverse (13331011311313), we get a palindrome (44642322324644).

The spelling of 31311311013331 in words is "thirty-one trillion, three hundred eleven billion, three hundred eleven million, thirteen thousand, three hundred thirty-one".