31131132143121 has 12 divisors (see below), whose sum is σ = 45815628437748. Its totient is φ = 20362501527264.

The previous prime is 31131132143119. The next prime is 31131132143161. The reversal of 31131132143121 is 12134123113113.

31131132143121 is a `hidden beast` number, since 3 + 1 + 1 + 311 + 32 + 1 + 4 + 312 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26018721731025 + 5112410412096 = 5100855^2 + 2261064^2 .

It is not a de Polignac number, because 31131132143121 - 2¹ = 31131132143119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131132143161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32632213510 + ... + 32632214463.

It is an arithmetic number, because the mean of its divisors is an integer number (3817969036479).

Almost surely, 2^{31131132143121} is an apocalyptic number.

It is an amenable number.

31131132143121 is a deficient number, since it is larger than the sum of its proper divisors (14684496294627).

31131132143121 is a wasteful number, since it uses less digits than its factorization.

31131132143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65264428032 (or 65264428029 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

Adding to 31131132143121 its reverse (12134123113113), we get a palindrome (43265255256234).

The spelling of 31131132143121 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred thirty-two million, one hundred forty-three thousand, one hundred twenty-one".