8061721 has 2 divisors, whose sum is σ = 8061722. Its totient is φ = 8061720.

The previous prime is 8061679. The next prime is 8061727. The reversal of 8061721 is 1271608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7901721 + 160000 = 2811^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 8061721 - 2⁷ = 8061593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8061727) 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, 4030860 + 4030861.

It is an arithmetic number, because the mean of its divisors is an integer number (4030861).

Almost surely, 2^8061721 is an apocalyptic number.

It is an amenable number.

8061721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8061721 is an equidigital number, since it uses as much as digits as its factorization.

8061721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 8061721 is about 2839.3169953353. The cubic root of 8061721 is about 200.5130245704.

The spelling of 8061721 in words is "eight million, sixty-one thousand, seven hundred twenty-one".