8119721 has 2 divisors, whose sum is σ = 8119722. Its totient is φ = 8119720.

The previous prime is 8119711. The next prime is 8119753. The reversal of 8119721 is 1279118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4840000 + 3279721 = 2200^2 + 1811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8119721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8119711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4059860 + 4059861.

It is an arithmetic number, because the mean of its divisors is an integer number (4059861).

Almost surely, 2^8119721 is an apocalyptic number.

It is an amenable number.

8119721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8119721 is an equidigital number, since it uses as much as digits as its factorization.

8119721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 8119721 is about 2849.5124144316. The cubic root of 8119721 is about 200.9927391914.

It can be divided in two parts, 81197 and 21, that added together give a palindrome (81218).

The spelling of 8119721 in words is "eight million, one hundred nineteen thousand, seven hundred twenty-one".