31311212231311 has 4 divisors (see below), whose sum is σ = 31312473736824. Its totient is φ = 31309950725800.

The previous prime is 31311212231303. The next prime is 31311212231339. The reversal of 31311212231311 is 11313221211313.

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 31311212231311 - 2³ = 31311212231303 is a prime.

It is a super-2 number, since 2×31311212231311² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311212231111) 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, 630715525 + ... + 630765166.

It is an arithmetic number, because the mean of its divisors is an integer number (7828118434206).

Almost surely, 2^{31311212231311} is an apocalyptic number.

31311212231311 is a deficient number, since it is larger than the sum of its proper divisors (1261505513).

31311212231311 is a wasteful number, since it uses less digits than its factorization.

31311212231311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261505512.

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

Adding to 31311212231311 its reverse (11313221211313), we get a palindrome (42624433442624).

The spelling of 31311212231311 in words is "thirty-one trillion, three hundred eleven billion, two hundred twelve million, two hundred thirty-one thousand, three hundred eleven".