8320657 has 2 divisors, whose sum is σ = 8320658. Its totient is φ = 8320656.

The previous prime is 8320619. The next prime is 8320681. The reversal of 8320657 is 7560238.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 1089936 = 2689^2 + 1044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8320657 is a prime.

It is equal to p₅₅₉₉₁₂ and since 8320657 and 559912 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8320057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160328 + 4160329.

It is an arithmetic number, because the mean of its divisors is an integer number (4160329).

Almost surely, 2^8320657 is an apocalyptic number.

It is an amenable number.

8320657 is a deficient number, since it is larger than the sum of its proper divisors (1).

8320657 is an equidigital number, since it uses as much as digits as its factorization.

8320657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 8320657 is about 2884.5549050070. The cubic root of 8320657 is about 202.6372143234.

The spelling of 8320657 in words is "eight million, three hundred twenty thousand, six hundred fifty-seven".