31123131232 has 24 divisors (see below), whose sum is σ = 61302472056. Its totient is φ = 15554249472.

The previous prime is 31123131227. The next prime is 31123131251. The reversal of 31123131232 is 23213132113.

It is a congruent number.

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, 159178 + ... + 295945.

It is an arithmetic number, because the mean of its divisors is an integer number (2554269669).

Almost surely, 2^31123131232 is an apocalyptic number.

31123131232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31123131232 is a deficient number, since it is larger than the sum of its proper divisors (30179340824).

31123131232 is a wasteful number, since it uses less digits than its factorization.

31123131232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457270 (or 457262 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 31123131232 its reverse (23213132113), we get a palindrome (54336263345).

The spelling of 31123131232 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty-one thousand, two hundred thirty-two".