864100109 has 4 divisors (see below), whose sum is σ = 887454204. Its totient is φ = 840746016.

The previous prime is 864100099. The next prime is 864100117. The reversal of 864100109 is 901001468.

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 308178025 + 555922084 = 17555^2 + 23578^2 .

It is a cyclic number.

It is not a de Polignac number, because 864100109 - 2²⁴ = 847322893 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 (864100129) 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, 11676992 + ... + 11677065.

It is an arithmetic number, because the mean of its divisors is an integer number (221863551).

Almost surely, 2^864100109 is an apocalyptic number.

It is an amenable number.

864100109 is a deficient number, since it is larger than the sum of its proper divisors (23354095).

864100109 is a wasteful number, since it uses less digits than its factorization.

864100109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23354094.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 864100109 is about 29395.5797527451. The cubic root of 864100109 is about 952.4774152075.

The spelling of 864100109 in words is "eight hundred sixty-four million, one hundred thousand, one hundred nine".