31821794990 has 16 divisors (see below), whose sum is σ = 57398820480. Its totient is φ = 12702142560.

The previous prime is 31821794959. The next prime is 31821794999. The reversal of 31821794990 is 9949712813.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31821794999) 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 7 ways as a sum of consecutive naturals, for example, 3316901 + ... + 3326480.

It is an arithmetic number, because the mean of its divisors is an integer number (3587426280).

Almost surely, 2^31821794990 is an apocalyptic number.

31821794990 is a deficient number, since it is larger than the sum of its proper divisors (25577025490).

31821794990 is a wasteful number, since it uses less digits than its factorization.

31821794990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6643867.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 31821794990 in words is "thirty-one billion, eight hundred twenty-one million, seven hundred ninety-four thousand, nine hundred ninety".