31132220232 has 16 divisors (see below), whose sum is σ = 77830550640. Its totient is φ = 10377406736.

The previous prime is 31132220221. The next prime is 31132220257. The reversal of 31132220232 is 23202223113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31132220199 and 31132220208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648587898 + ... + 648587945.

It is an arithmetic number, because the mean of its divisors is an integer number (4864409415).

Almost surely, 2^31132220232 is an apocalyptic number.

It is an amenable number.

31132220232 is an abundant number, since it is smaller than the sum of its proper divisors (46698330408).

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

31132220232 is a wasteful number, since it uses less digits than its factorization.

31132220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297175852 (or 1297175848 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31132220232 its reverse (23202223113), we get a palindrome (54334443345).

The spelling of 31132220232 in words is "thirty-one billion, one hundred thirty-two million, two hundred twenty thousand, two hundred thirty-two".