8306993921 has 2 divisors, whose sum is σ = 8306993922. Its totient is φ = 8306993920.

The previous prime is 8306993911. The next prime is 8306993963. The reversal of 8306993921 is 1293996038.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6767530225 + 1539463696 = 82265^2 + 39236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8306993921 is a prime.

It is a super-2 number, since 2×8306993921² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8306993921.

It is not a weakly prime, because it can be changed into another prime (8306993911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4153496960 + 4153496961.

It is an arithmetic number, because the mean of its divisors is an integer number (4153496961).

Almost surely, 2^8306993921 is an apocalyptic number.

It is an amenable number.

8306993921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8306993921 is an equidigital number, since it uses as much as digits as its factorization.

8306993921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 8306993921 is about 91142.7118369867. The cubic root of 8306993921 is about 2025.2623890854.

The spelling of 8306993921 in words is "eight billion, three hundred six million, nine hundred ninety-three thousand, nine hundred twenty-one".