2991384999 has 40 divisors (see below), whose sum is σ = 4606644240. Its totient is φ = 1933352064.

The previous prime is 2991384997. The next prime is 2991385049. The reversal of 2991384999 is 9994831992.

2991384999 is a `hidden beast` number, since 2 + 9 + 9 + 138 + 499 + 9 = 666.

It is not a de Polignac number, because 2991384999 - 2¹ = 2991384997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991384997) 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 39 ways as a sum of consecutive naturals, for example, 474037 + ... + 480305.

It is an arithmetic number, because the mean of its divisors is an integer number (115166106).

Almost surely, 2^2991384999 is an apocalyptic number.

2991384999 is a deficient number, since it is larger than the sum of its proper divisors (1615259241).

2991384999 is a wasteful number, since it uses less digits than its factorization.

2991384999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461 (or 6452 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 63.

The square root of 2991384999 is about 54693.5553698971. Note that the first 3 decimals coincide. The cubic root of 2991384999 is about 1440.8676931995.

The spelling of 2991384999 in words is "two billion, nine hundred ninety-one million, three hundred eighty-four thousand, nine hundred ninety-nine".