100991908 has 12 divisors (see below), whose sum is σ = 180496512. Its totient is φ = 49421480.

The previous prime is 100991899. The next prime is 100991911. The reversal of 100991908 is 809199001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268408 + ... + 268783.

It is an arithmetic number, because the mean of its divisors is an integer number (15041376).

Almost surely, 2^100991908 is an apocalyptic number.

It is an amenable number.

100991908 is a deficient number, since it is larger than the sum of its proper divisors (79504604).

100991908 is a wasteful number, since it uses less digits than its factorization.

100991908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537242 (or 537240 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 100991908 is about 10049.4730210096. The cubic root of 100991908 is about 465.6885133126.

The spelling of 100991908 in words is "one hundred million, nine hundred ninety-one thousand, nine hundred eight".