8320681 has 2 divisors, whose sum is σ = 8320682. Its totient is φ = 8320680.

The previous prime is 8320657. The next prime is 8320693. The reversal of 8320681 is 1860238.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7750656 + 570025 = 2784^2 + 755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8320681 is a prime.

It is a super-2 number, since 2×8320681² = 138467464607522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8320601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160340 + 4160341.

It is an arithmetic number, because the mean of its divisors is an integer number (4160341).

Almost surely, 2^8320681 is an apocalyptic number.

It is an amenable number.

8320681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8320681 is an equidigital number, since it uses as much as digits as its factorization.

8320681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8320681 is about 2884.5590650912. The cubic root of 8320681 is about 202.6374091513.

The spelling of 8320681 in words is "eight million, three hundred twenty thousand, six hundred eighty-one".