108801991 has 2 divisors, whose sum is σ = 108801992. Its totient is φ = 108801990.

The previous prime is 108801967. The next prime is 108802009. The reversal of 108801991 is 199108801.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 108801991 - 2⁷ = 108801863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108801991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108801191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54400995 + 54400996.

It is an arithmetic number, because the mean of its divisors is an integer number (54400996).

Almost surely, 2^108801991 is an apocalyptic number.

108801991 is a deficient number, since it is larger than the sum of its proper divisors (1).

108801991 is an equidigital number, since it uses as much as digits as its factorization.

108801991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 108801991 is about 10430.8192870934. The cubic root of 108801991 is about 477.3961887937.

The spelling of 108801991 in words is "one hundred eight million, eight hundred one thousand, nine hundred ninety-one".