8109999 has 6 divisors (see below), whose sum is σ = 11714456. Its totient is φ = 5406660.

The previous prime is 8109973. The next prime is 8110009. The reversal of 8109999 is 9999018.

It is not a de Polignac number, because 8109999 - 2⁵ = 8109967 is a prime.

It is a Duffinian number.

8109999 is a modest number, since divided by 9999 gives 810 as remainder.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8107999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450547 + ... + 450564.

Almost surely, 2^8109999 is an apocalyptic number.

8109999 is a deficient number, since it is larger than the sum of its proper divisors (3604457).

8109999 is a wasteful number, since it uses less digits than its factorization.

8109999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901117 (or 901114 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 8109999 is about 2847.8059976059. The cubic root of 8109999 is about 200.9124888227.

The spelling of 8109999 in words is "eight million, one hundred nine thousand, nine hundred ninety-nine".