8830891721 has 2 divisors, whose sum is σ = 8830891722. Its totient is φ = 8830891720.

The previous prime is 8830891627. The next prime is 8830891807. The reversal of 8830891721 is 1271980388.

8830891721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5956752400 + 2874139321 = 77180^2 + 53611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8830891721 is a prime.

It is not a weakly prime, because it can be changed into another prime (8830897721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4415445860 + 4415445861.

It is an arithmetic number, because the mean of its divisors is an integer number (4415445861).

Almost surely, 2^8830891721 is an apocalyptic number.

It is an amenable number.

8830891721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8830891721 is an equidigital number, since it uses as much as digits as its factorization.

8830891721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 8830891721 is about 93972.8243749223. The cubic root of 8830891721 is about 2066.9732360191.

The spelling of 8830891721 in words is "eight billion, eight hundred thirty million, eight hundred ninety-one thousand, seven hundred twenty-one".