8120507999 has 4 divisors (see below), whose sum is σ = 8133059664. Its totient is φ = 8107956336.

The previous prime is 8120507981. The next prime is 8120508023. The reversal of 8120507999 is 9997050218.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8120507999 - 2¹² = 8120503903 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 (8120507699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6274862 + ... + 6276155.

It is an arithmetic number, because the mean of its divisors is an integer number (2033264916).

Almost surely, 2^8120507999 is an apocalyptic number.

8120507999 is a deficient number, since it is larger than the sum of its proper divisors (12551665).

8120507999 is a wasteful number, since it uses less digits than its factorization.

8120507999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12551664.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 8120507999 is about 90113.8613033533. The cubic root of 8120507999 is about 2009.9923268108.

The spelling of 8120507999 in words is "eight billion, one hundred twenty million, five hundred seven thousand, nine hundred ninety-nine".