108991601 has 2 divisors, whose sum is σ = 108991602. Its totient is φ = 108991600.

The previous prime is 108991579. The next prime is 108991609. The reversal of 108991601 is 106199801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71842576 + 37149025 = 8476^2 + 6095^2 .

It is an emirp because it is prime and its reverse (106199801) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 109166801 and 108661901.

It is a cyclic number.

It is not a de Polignac number, because 108991601 - 2¹⁰ = 108990577 is a prime.

It is not a weakly prime, because it can be changed into another prime (108991609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54495800 + 54495801.

It is an arithmetic number, because the mean of its divisors is an integer number (54495801).

Almost surely, 2^108991601 is an apocalyptic number.

It is an amenable number.

108991601 is a deficient number, since it is larger than the sum of its proper divisors (1).

108991601 is an equidigital number, since it uses as much as digits as its factorization.

108991601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 108991601 is about 10439.9042620131. The cubic root of 108991601 is about 477.6733484259.

The spelling of 108991601 in words is "one hundred eight million, nine hundred ninety-one thousand, six hundred one".