8120999249 has 8 divisors (see below), whose sum is σ = 8866380000. Its totient is φ = 7376803200.

The previous prime is 8120999207. The next prime is 8120999281. The reversal of 8120999249 is 9429990218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8120999249 - 2⁸ = 8120998993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8120999249.

It is not an unprimeable number, because it can be changed into a prime (8120999849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281807 + ... + 309284.

It is an arithmetic number, because the mean of its divisors is an integer number (1108297500).

Almost surely, 2^8120999249 is an apocalyptic number.

It is an amenable number.

8120999249 is a deficient number, since it is larger than the sum of its proper divisors (745380751).

8120999249 is a wasteful number, since it uses less digits than its factorization.

8120999249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592351.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 8120999249 is about 90116.5869804222. The cubic root of 8120999249 is about 2010.0328574779.

The spelling of 8120999249 in words is "eight billion, one hundred twenty million, nine hundred ninety-nine thousand, two hundred forty-nine".