31120032131231 has 4 divisors (see below), whose sum is σ = 31126649195712. Its totient is φ = 31113415066752.

The previous prime is 31120032131213. The next prime is 31120032131257. The reversal of 31120032131231 is 13213123002113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120032131231 is a prime.

It is a super-2 number, since 2×31120032131231² (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 = 31120032131197 and 31120032131206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120032131291) 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, 3308525186 + ... + 3308534591.

It is an arithmetic number, because the mean of its divisors is an integer number (7781662298928).

Almost surely, 2^{31120032131231} is an apocalyptic number.

31120032131231 is a deficient number, since it is larger than the sum of its proper divisors (6617064481).

31120032131231 is an equidigital number, since it uses as much as digits as its factorization.

31120032131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617064480.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31120032131231 its reverse (13213123002113), we get a palindrome (44333155133344).

The spelling of 31120032131231 in words is "thirty-one trillion, one hundred twenty billion, thirty-two million, one hundred thirty-one thousand, two hundred thirty-one".