31994197144 has 96 divisors (see below), whose sum is σ = 74897917920. Its totient is φ = 12544616448.

The previous prime is 31994197139. The next prime is 31994197159. The reversal of 31994197144 is 44179149913.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 31994197091 and 31994197100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1054474 + ... + 1084390.

It is an arithmetic number, because the mean of its divisors is an integer number (780186645).

Almost surely, 2^31994197144 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 31994197144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37448958960).

31994197144 is an abundant number, since it is smaller than the sum of its proper divisors (42903720776).

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

31994197144 is a wasteful number, since it uses less digits than its factorization.

31994197144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30069 (or 30052 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The spelling of 31994197144 in words is "thirty-one billion, nine hundred ninety-four million, one hundred ninety-seven thousand, one hundred forty-four".