31012111232 has 64 divisors (see below), whose sum is σ = 62630366400. Its totient is φ = 15293988864.

The previous prime is 31012111231. The next prime is 31012111261. The reversal of 31012111232 is 23211121013.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 31012111232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012111231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4929593 + ... + 4935879.

It is an arithmetic number, because the mean of its divisors is an integer number (978599475).

Almost surely, 2^31012111232 is an apocalyptic number.

31012111232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31012111232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31315183200).

31012111232 is an abundant number, since it is smaller than the sum of its proper divisors (31618255168).

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

31012111232 is an equidigital number, since it uses as much as digits as its factorization.

31012111232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823 (or 6811 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31012111232 its reverse (23211121013), we get a palindrome (54223232245).

The spelling of 31012111232 in words is "thirty-one billion, twelve million, one hundred eleven thousand, two hundred thirty-two".