31313121132 has 12 divisors (see below), whose sum is σ = 73063949336. Its totient is φ = 10437707040.

The previous prime is 31313121109. The next prime is 31313121137. The reversal of 31313121132 is 23112131313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31313121132² (a number of 22 digits) contains 22 as substring.

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 = 31313121099 and 31313121108.

It is not an unprimeable number, because it can be changed into a prime (31313121137) 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, 1304713369 + ... + 1304713392.

Almost surely, 2^31313121132 is an apocalyptic number.

It is an amenable number.

31313121132 is an abundant number, since it is smaller than the sum of its proper divisors (41750828204).

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

31313121132 is a wasteful number, since it uses less digits than its factorization.

31313121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609426768 (or 2609426766 counting only the distinct ones).

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

Adding to 31313121132 its reverse (23112131313), we get a palindrome (54425252445).

The spelling of 31313121132 in words is "thirty-one billion, three hundred thirteen million, one hundred twenty-one thousand, one hundred thirty-two".