31883530812 has 72 divisors (see below), whose sum is σ = 86870738304. Its totient is φ = 8915707488.

The previous prime is 31883530807. The next prime is 31883530817. The reversal of 31883530812 is 21803538813.

It is an interprime number because it is at equal distance from previous prime (31883530807) and next prime (31883530817).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31883530817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99643 + ... + 271469.

It is an arithmetic number, because the mean of its divisors is an integer number (1206538032).

Almost surely, 2^31883530812 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 31883530812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43435369152).

31883530812 is an abundant number, since it is smaller than the sum of its proper divisors (54987207492).

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

31883530812 is a wasteful number, since it uses less digits than its factorization.

31883530812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171935 (or 171886 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 31883530812 in words is "thirty-one billion, eight hundred eighty-three million, five hundred thirty thousand, eight hundred twelve".