31211232312 has 80 divisors (see below), whose sum is σ = 84532049640. Its totient is φ = 9603245184.

The previous prime is 31211232301. The next prime is 31211232313. The reversal of 31211232312 is 21323211213.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211232313) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 662698 + ... + 708230.

Almost surely, 2^31211232312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31211232312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42266024820).

31211232312 is an abundant number, since it is smaller than the sum of its proper divisors (53320817328).

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

31211232312 is an equidigital number, since it uses as much as digits as its factorization.

31211232312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45594 (or 45551 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 31211232312 its reverse (21323211213), we get a palindrome (52534443525).

The spelling of 31211232312 in words is "thirty-one billion, two hundred eleven million, two hundred thirty-two thousand, three hundred twelve".