100855809 has 12 divisors (see below), whose sum is σ = 146555136. Its totient is φ = 66833592.

The previous prime is 100855801. The next prime is 100855841. The reversal of 100855809 is 908558001.

It is not a de Polignac number, because 100855809 - 2³ = 100855801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100855801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32049 + ... + 35054.

It is an arithmetic number, because the mean of its divisors is an integer number (12212928).

Almost surely, 2^100855809 is an apocalyptic number.

It is an amenable number.

100855809 is a deficient number, since it is larger than the sum of its proper divisors (45699327).

100855809 is a wasteful number, since it uses less digits than its factorization.

100855809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67276 (or 67273 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 100855809 is about 10042.6992885379. The cubic root of 100855809 is about 465.4792284493.

The spelling of 100855809 in words is "one hundred million, eight hundred fifty-five thousand, eight hundred nine".