31311312112231 has 8 divisors (see below), whose sum is σ = 32329380729344. Its totient is φ = 30293745138360.

The previous prime is 31311312112219. The next prime is 31311312112261. The reversal of 31311312112231 is 13221121311313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31311312112231 - 2³¹ = 31309164628583 is a prime.

It is a super-2 number, since 2×31311312112231² (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 = 31311312112196 and 31311312112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311312112211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125283945 + ... + 125533618.

It is an arithmetic number, because the mean of its divisors is an integer number (4041172591168).

Almost surely, 2^{31311312112231} is an apocalyptic number.

31311312112231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31311312112231 is a deficient number, since it is larger than the sum of its proper divisors (1018068617113).

31311312112231 is a wasteful number, since it uses less digits than its factorization.

31311312112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250821621.

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

Adding to 31311312112231 its reverse (13221121311313), we get a palindrome (44532433423544).

The spelling of 31311312112231 in words is "thirty-one trillion, three hundred eleven billion, three hundred twelve million, one hundred twelve thousand, two hundred thirty-one".