31131312132 has 48 divisors (see below), whose sum is σ = 72990312192. Its totient is φ = 10327092000.

The previous prime is 31131312131. The next prime is 31131312143. The reversal of 31131312132 is 23121313113.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31131312099 and 31131312108.

It is not an unprimeable number, because it can be changed into a prime (31131312131) 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, 4294503 + ... + 4301745.

It is an arithmetic number, because the mean of its divisors is an integer number (1520631504).

Almost surely, 2^31131312132 is an apocalyptic number.

It is an amenable number.

31131312132 is an abundant number, since it is smaller than the sum of its proper divisors (41859000060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131312132 is a wasteful number, since it uses less digits than its factorization.

31131312132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8928 (or 8926 counting only the distinct ones).

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

Adding to 31131312132 its reverse (23121313113), we get a palindrome (54252625245).

The spelling of 31131312132 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, one hundred thirty-two".