31131012212031 has 8 divisors (see below), whose sum is σ = 43692648718720. Its totient is φ = 19661691923352.

The previous prime is 31131012212017. The next prime is 31131012212033. The reversal of 31131012212031 is 13021221013113.

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

It is not a de Polignac number, because 31131012212031 - 2¹⁸ = 31131011949887 is a prime.

It is a super-2 number, since 2×31131012212031² (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 = 31131012211989 and 31131012212007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131012212033) 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, 273079054435 + ... + 273079054548.

It is an arithmetic number, because the mean of its divisors is an integer number (5461581089840).

Almost surely, 2^{31131012212031} is an apocalyptic number.

31131012212031 is a deficient number, since it is larger than the sum of its proper divisors (12561636506689).

31131012212031 is a wasteful number, since it uses less digits than its factorization.

31131012212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546158109005.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31131012212031 its reverse (13021221013113), we get a palindrome (44152233225144).

The spelling of 31131012212031 in words is "thirty-one trillion, one hundred thirty-one billion, twelve million, two hundred twelve thousand, thirty-one".