8650721 has 2 divisors, whose sum is σ = 8650722. Its totient is φ = 8650720.

The previous prime is 8650709. The next prime is 8650723. The reversal of 8650721 is 1270568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 30625 = 2936^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 8650721 - 2⁶ = 8650657 is a prime.

Together with 8650723, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 8650721 parts by 4159 straight cuts.

It is not a weakly prime, because it can be changed into another prime (8650723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4325360 + 4325361.

It is an arithmetic number, because the mean of its divisors is an integer number (4325361).

Almost surely, 2^8650721 is an apocalyptic number.

It is an amenable number.

8650721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8650721 is an equidigital number, since it uses as much as digits as its factorization.

8650721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 8650721 is about 2941.2108050937. The cubic root of 8650721 is about 205.2819519096.

The spelling of 8650721 in words is "eight million, six hundred fifty thousand, seven hundred twenty-one".