31131222232 has 16 divisors (see below), whose sum is σ = 63677500200. Its totient is φ = 14150555520.

The previous prime is 31131222229. The next prime is 31131222233. The reversal of 31131222232 is 23222213113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131222233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176881857 + ... + 176882032.

Almost surely, 2^31131222232 is an apocalyptic number.

It is an amenable number.

31131222232 is an abundant number, since it is smaller than the sum of its proper divisors (32546277968).

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

31131222232 is a wasteful number, since it uses less digits than its factorization.

31131222232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353763906 (or 353763902 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 31131222232 its reverse (23222213113), we get a palindrome (54353435345).

The spelling of 31131222232 in words is "thirty-one billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred thirty-two".