31211643372 has 96 divisors (see below), whose sum is σ = 90521217024. Its totient is φ = 8150112000.

The previous prime is 31211643301. The next prime is 31211643377. The reversal of 31211643372 is 27334611213.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (31211643377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31204 + ... + 251787.

It is an arithmetic number, because the mean of its divisors is an integer number (942929344).

Almost surely, 2^31211643372 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 31211643372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45260608512).

31211643372 is an abundant number, since it is smaller than the sum of its proper divisors (59309573652).

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

31211643372 is a wasteful number, since it uses less digits than its factorization.

31211643372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283119 (or 283117 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The spelling of 31211643372 in words is "thirty-one billion, two hundred eleven million, six hundred forty-three thousand, three hundred seventy-two".