31132131213 has 16 divisors (see below), whose sum is σ = 41905382400. Its totient is φ = 20557512240.

The previous prime is 31132131211. The next prime is 31132131221. The reversal of 31132131213 is 31213123113.

It is a happy number.

It is not a de Polignac number, because 31132131213 - 2¹ = 31132131211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31132131213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132131211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93118 + ... + 266336.

It is an arithmetic number, because the mean of its divisors is an integer number (2619086400).

Almost surely, 2^31132131213 is an apocalyptic number.

It is an amenable number.

31132131213 is a deficient number, since it is larger than the sum of its proper divisors (10773251187).

31132131213 is a wasteful number, since it uses less digits than its factorization.

31132131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173792.

The product of its digits is 324, while the sum is 21.

Adding to 31132131213 its reverse (31213123113), we get a palindrome (62345254326).

The spelling of 31132131213 in words is "thirty-one billion, one hundred thirty-two million, one hundred thirty-one thousand, two hundred thirteen".