108720817 has 2 divisors, whose sum is σ = 108720818. Its totient is φ = 108720816.

The previous prime is 108720811. The next prime is 108720847. The reversal of 108720817 is 718027801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66846976 + 41873841 = 8176^2 + 6471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108720817 is a prime.

It is not a weakly prime, because it can be changed into another prime (108720811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54360408 + 54360409.

It is an arithmetic number, because the mean of its divisors is an integer number (54360409).

Almost surely, 2^108720817 is an apocalyptic number.

It is an amenable number.

108720817 is a deficient number, since it is larger than the sum of its proper divisors (1).

108720817 is an equidigital number, since it uses as much as digits as its factorization.

108720817 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 34.

The square root of 108720817 is about 10426.9274956720. The cubic root of 108720817 is about 477.2774354536.

It can be divided in two parts, 1087 and 20817, that added together give a square (21904 = 148²).

The spelling of 108720817 in words is "one hundred eight million, seven hundred twenty thousand, eight hundred seventeen".