108144721 has 2 divisors, whose sum is σ = 108144722. Its totient is φ = 108144720.

The previous prime is 108144703. The next prime is 108144731. The reversal of 108144721 is 127441801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94187025 + 13957696 = 9705^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 108144721 - 2⁹ = 108144209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108144721.

It is not a weakly prime, because it can be changed into another prime (108144731) 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, 54072360 + 54072361.

It is an arithmetic number, because the mean of its divisors is an integer number (54072361).

Almost surely, 2^108144721 is an apocalyptic number.

It is an amenable number.

108144721 is a deficient number, since it is larger than the sum of its proper divisors (1).

108144721 is an equidigital number, since it uses as much as digits as its factorization.

108144721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 108144721 is about 10399.2654067487. The cubic root of 108144721 is about 476.4329338594.

The spelling of 108144721 in words is "one hundred eight million, one hundred forty-four thousand, seven hundred twenty-one".