31172949494784 has 528 divisors, whose sum is σ = 97681398912000. Its totient is φ = 9801982181376.

The previous prime is 31172949494779. The next prime is 31172949494839. The reversal of 31172949494784 is 48749494927113.

31172949494784 is a `hidden beast` number, since 3 + 1 + 1 + 7 + 29 + 49 + 494 + 78 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3388727817 + ... + 3388737015.

Almost surely, 2^{31172949494784} 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 31172949494784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48840699456000).

31172949494784 is an abundant number, since it is smaller than the sum of its proper divisors (66508449417216).

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

31172949494784 is an equidigital number, since it uses as much as digits as its factorization.

31172949494784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9397 (or 9300 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 72.

The spelling of 31172949494784 in words is "thirty-one trillion, one hundred seventy-two billion, nine hundred forty-nine million, four hundred ninety-four thousand, seven hundred eighty-four".