108491259817 has 4 divisors (see below), whose sum is σ = 108492026580. Its totient is φ = 108490493056.

The previous prime is 108491259781. The next prime is 108491259839. The reversal of 108491259817 is 718952194801.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 718952194801 = 293 ⋅2453761757.

It can be written as a sum of positive squares in 2 ways, for example, as 37364503401 + 71126756416 = 193299^2 + 266696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108491259817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108491259017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102592 + ... + 476977.

It is an arithmetic number, because the mean of its divisors is an integer number (27123006645).

Almost surely, 2^108491259817 is an apocalyptic number.

It is an amenable number.

108491259817 is a deficient number, since it is larger than the sum of its proper divisors (766763).

108491259817 is an equidigital number, since it uses as much as digits as its factorization.

108491259817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766762.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The spelling of 108491259817 in words is "one hundred eight billion, four hundred ninety-one million, two hundred fifty-nine thousand, eight hundred seventeen".