108718721 has 2 divisors, whose sum is σ = 108718722. Its totient is φ = 108718720.

The previous prime is 108718717. The next prime is 108718733. The reversal of 108718721 is 127817801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 39828721 = 8300^2 + 6311^2 .

It is a cyclic number.

It is not a de Polignac number, because 108718721 - 2² = 108718717 is a prime.

It is not a weakly prime, because it can be changed into another prime (108748721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54359360 + 54359361.

It is an arithmetic number, because the mean of its divisors is an integer number (54359361).

Almost surely, 2^108718721 is an apocalyptic number.

It is an amenable number.

108718721 is a deficient number, since it is larger than the sum of its proper divisors (1).

108718721 is an equidigital number, since it uses as much as digits as its factorization.

108718721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 108718721 is about 10426.8269861929. The cubic root of 108718721 is about 477.2743683319.

The spelling of 108718721 in words is "one hundred eight million, seven hundred eighteen thousand, seven hundred twenty-one".