100844109 has 10 divisors (see below), whose sum is σ = 150643790. Its totient is φ = 67229352.

The previous prime is 100844101. The next prime is 100844113. The reversal of 100844109 is 901448001.

It can be written as a sum of positive squares in only one way, i.e., 100701225 + 142884 = 10035^2 + 378^2 .

It is not a de Polignac number, because 100844109 - 2³ = 100844101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100844101) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 622414 + ... + 622575.

It is an arithmetic number, because the mean of its divisors is an integer number (15064379).

Almost surely, 2^100844109 is an apocalyptic number.

It is an amenable number.

100844109 is a deficient number, since it is larger than the sum of its proper divisors (49799681).

100844109 is an equidigital number, since it uses as much as digits as its factorization.

100844109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245001 (or 1244992 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 100844109 is about 10042.1167589309. The cubic root of 100844109 is about 465.4612281060.

The spelling of 100844109 in words is "one hundred million, eight hundred forty-four thousand, one hundred nine".