108998891569 has 2 divisors, whose sum is σ = 108998891570. Its totient is φ = 108998891568.

The previous prime is 108998891567. The next prime is 108998891621. The reversal of 108998891569 is 965198899801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69769939600 + 39228951969 = 264140^2 + 198063^2 .

It is a cyclic number.

It is not a de Polignac number, because 108998891569 - 2¹ = 108998891567 is a prime.

It is a super-2 number, since 2×108998891569² (a number of 23 digits) contains 22 as substring.

Together with 108998891567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (108998891563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54499445784 + 54499445785.

It is an arithmetic number, because the mean of its divisors is an integer number (54499445785).

Almost surely, 2^108998891569 is an apocalyptic number.

It is an amenable number.

108998891569 is a deficient number, since it is larger than the sum of its proper divisors (1).

108998891569 is an equidigital number, since it uses as much as digits as its factorization.

108998891569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100776960, while the sum is 73.

The spelling of 108998891569 in words is "one hundred eight billion, nine hundred ninety-eight million, eight hundred ninety-one thousand, five hundred sixty-nine".