8682721 has 2 divisors, whose sum is σ = 8682722. Its totient is φ = 8682720.

The previous prime is 8682719. The next prime is 8682727. The reversal of 8682721 is 1272868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 336400 = 2889^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 8682721 - 2¹ = 8682719 is a prime.

Together with 8682719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8682727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4341360 + 4341361.

It is an arithmetic number, because the mean of its divisors is an integer number (4341361).

Almost surely, 2^8682721 is an apocalyptic number.

It is an amenable number.

8682721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8682721 is an equidigital number, since it uses as much as digits as its factorization.

8682721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 8682721 is about 2946.6457201367. The cubic root of 8682721 is about 205.5347608648.

The spelling of 8682721 in words is "eight million, six hundred eighty-two thousand, seven hundred twenty-one".