108991902 has 16 divisors (see below), whose sum is σ = 219081600. Its totient is φ = 36147672.

The previous prime is 108991873. The next prime is 108991907. The reversal of 108991902 is 209199801.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108991907) 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 in 7 ways as a sum of consecutive naturals, for example, 44448 + ... + 46835.

It is an arithmetic number, because the mean of its divisors is an integer number (13692600).

Almost surely, 2^108991902 is an apocalyptic number.

108991902 is an abundant number, since it is smaller than the sum of its proper divisors (110089698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

108991902 is a wasteful number, since it uses less digits than its factorization.

108991902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91487.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 108991902 is about 10439.9186778442. The cubic root of 108991902 is about 477.6737881526.

The spelling of 108991902 in words is "one hundred eight million, nine hundred ninety-one thousand, nine hundred two".