84117109 has 4 divisors (see below), whose sum is σ = 85496140. Its totient is φ = 82738080.

The previous prime is 84117091. The next prime is 84117133. The reversal of 84117109 is 90171148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34456900 + 49660209 = 5870^2 + 7047^2 .

It is a cyclic number.

It is not a de Polignac number, because 84117109 - 2⁹ = 84116597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84117809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689424 + ... + 689545.

It is an arithmetic number, because the mean of its divisors is an integer number (21374035).

Almost surely, 2^84117109 is an apocalyptic number.

It is an amenable number.

84117109 is a deficient number, since it is larger than the sum of its proper divisors (1379031).

84117109 is a wasteful number, since it uses less digits than its factorization.

84117109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379030.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 84117109 is about 9171.5379844386. The cubic root of 84117109 is about 438.1553437293.

The spelling of 84117109 in words is "eighty-four million, one hundred seventeen thousand, one hundred nine".