31985432621 has 8 divisors (see below), whose sum is σ = 32441739264. Its totient is φ = 31529287440.

The previous prime is 31985432581. The next prime is 31985432659. The reversal of 31985432621 is 12623458913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31985432621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31985432671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391316 + ... + 465938.

It is an arithmetic number, because the mean of its divisors is an integer number (4055217408).

Almost surely, 2^31985432621 is an apocalyptic number.

It is an amenable number.

31985432621 is a deficient number, since it is larger than the sum of its proper divisors (456306643).

31985432621 is an equidigital number, since it uses as much as digits as its factorization.

31985432621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80731.

The product of its digits is 311040, while the sum is 44.

The spelling of 31985432621 in words is "thirty-one billion, nine hundred eighty-five million, four hundred thirty-two thousand, six hundred twenty-one".