8811721 has 2 divisors, whose sum is σ = 8811722. Its totient is φ = 8811720.

The previous prime is 8811707. The next prime is 8811731. The reversal of 8811721 is 1271188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 1863225 = 2636^2 + 1365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8811721 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8811721.

It is not a weakly prime, because it can be changed into another prime (8811731) 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, 4405860 + 4405861.

It is an arithmetic number, because the mean of its divisors is an integer number (4405861).

Almost surely, 2^8811721 is an apocalyptic number.

It is an amenable number.

8811721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8811721 is an equidigital number, since it uses as much as digits as its factorization.

8811721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 28.

The square root of 8811721 is about 2968.4543115905. The cubic root of 8811721 is about 206.5476442077.

The spelling of 8811721 in words is "eight million, eight hundred eleven thousand, seven hundred twenty-one".