31031321232 has 20 divisors (see below), whose sum is σ = 80164246640. Its totient is φ = 10343773728.

The previous prime is 31031321197. The next prime is 31031321239. The reversal of 31031321232 is 23212313013.

It is a junction number, because it is equal to n+sod(n) for n = 31031321199 and 31031321208.

It is not an unprimeable number, because it can be changed into a prime (31031321239) 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, 323242882 + ... + 323242977.

It is an arithmetic number, because the mean of its divisors is an integer number (4008212332).

Almost surely, 2^31031321232 is an apocalyptic number.

It is an amenable number.

31031321232 is an abundant number, since it is smaller than the sum of its proper divisors (49132925408).

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

31031321232 is a wasteful number, since it uses less digits than its factorization.

31031321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646485870 (or 646485864 counting only the distinct ones).

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

Adding to 31031321232 its reverse (23212313013), we get a palindrome (54243634245).

The spelling of 31031321232 in words is "thirty-one billion, thirty-one million, three hundred twenty-one thousand, two hundred thirty-two".