8120999242 has 32 divisors (see below), whose sum is σ = 12604410000. Its totient is φ = 3921297408.

The previous prime is 8120999207. The next prime is 8120999281. The reversal of 8120999242 is 2429990218.

It can be written as a sum of positive squares in 8 ways, for example, as 6752073241 + 1368926001 = 82171^2 + 36999^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8120999192 and 8120999201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7741134 + ... + 7742182.

Almost surely, 2^8120999242 is an apocalyptic number.

8120999242 is a deficient number, since it is larger than the sum of its proper divisors (4483410758).

8120999242 is a wasteful number, since it uses less digits than its factorization.

8120999242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 8120999242 is about 90116.5869415836. The cubic root of 8120999242 is about 2010.0328569004.

The spelling of 8120999242 in words is "eight billion, one hundred twenty million, nine hundred ninety-nine thousand, two hundred forty-two".