108193721 has 2 divisors, whose sum is σ = 108193722. Its totient is φ = 108193720.

The previous prime is 108193717. The next prime is 108193747. The reversal of 108193721 is 127391801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 52765696 = 7445^2 + 7264^2 .

It is an emirp because it is prime and its reverse (127391801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108193721 - 2² = 108193717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (108193781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54096860 + 54096861.

It is an arithmetic number, because the mean of its divisors is an integer number (54096861).

Almost surely, 2^108193721 is an apocalyptic number.

It is an amenable number.

108193721 is a deficient number, since it is larger than the sum of its proper divisors (1).

108193721 is an equidigital number, since it uses as much as digits as its factorization.

108193721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 108193721 is about 10401.6210755824. The cubic root of 108193721 is about 476.5048797005.

The spelling of 108193721 in words is "one hundred eight million, one hundred ninety-three thousand, seven hundred twenty-one".