8721940093 has 2 divisors, whose sum is σ = 8721940094. Its totient is φ = 8721940092.

The previous prime is 8721940069. The next prime is 8721940141. The reversal of 8721940093 is 3900491278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7974847204 + 747092889 = 89302^2 + 27333^2 .

It is a cyclic number.

It is not a de Polignac number, because 8721940093 - 2⁹ = 8721939581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8721940013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360970046 + 4360970047.

It is an arithmetic number, because the mean of its divisors is an integer number (4360970047).

Almost surely, 2^8721940093 is an apocalyptic number.

It is an amenable number.

8721940093 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721940093 is an equidigital number, since it uses as much as digits as its factorization.

8721940093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 8721940093 is about 93391.3277183701. The cubic root of 8721940093 is about 2058.4375695374.

The spelling of 8721940093 in words is "eight billion, seven hundred twenty-one million, nine hundred forty thousand, ninety-three".