7659721 has 2 divisors, whose sum is σ = 7659722. Its totient is φ = 7659720.

The previous prime is 7659647. The next prime is 7659727. The reversal of 7659721 is 1279567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7590025 + 69696 = 2755^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 7659721 - 2⁹ = 7659209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7659727) 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, 3829860 + 3829861.

It is an arithmetic number, because the mean of its divisors is an integer number (3829861).

Almost surely, 2^7659721 is an apocalyptic number.

It is an amenable number.

7659721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7659721 is an equidigital number, since it uses as much as digits as its factorization.

7659721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 7659721 is about 2767.6200967618. The cubic root of 7659721 is about 197.1231590075.

The spelling of 7659721 in words is "seven million, six hundred fifty-nine thousand, seven hundred twenty-one".