31313220132 has 48 divisors (see below), whose sum is σ = 73701714240. Its totient is φ = 10347050112.

The previous prime is 31313220121. The next prime is 31313220137. The reversal of 31313220132 is 23102231313.

It is a junction number, because it is equal to n+sod(n) for n = 31313220099 and 31313220108.

It is not an unprimeable number, because it can be changed into a prime (31313220137) 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, 630919 + ... + 678737.

It is an arithmetic number, because the mean of its divisors is an integer number (1535452380).

Almost surely, 2^31313220132 is an apocalyptic number.

It is an amenable number.

31313220132 is an abundant number, since it is smaller than the sum of its proper divisors (42388494108).

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

31313220132 is a wasteful number, since it uses less digits than its factorization.

31313220132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48300 (or 48298 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31313220132 its reverse (23102231313), we get a palindrome (54415451445).

The spelling of 31313220132 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty thousand, one hundred thirty-two".