2981991893 has 16 divisors (see below), whose sum is σ = 3063708672. Its totient is φ = 2901528000.

The previous prime is 2981991889. The next prime is 2981991899. The reversal of 2981991893 is 3981991892.

It is a cyclic number.

It is not a de Polignac number, because 2981991893 - 2² = 2981991889 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 (2981991899) 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 15 ways as a sum of consecutive naturals, for example, 2457755 + ... + 2458967.

It is an arithmetic number, because the mean of its divisors is an integer number (191481792).

Almost surely, 2^2981991893 is an apocalyptic number.

It is an amenable number.

2981991893 is a deficient number, since it is larger than the sum of its proper divisors (81716779).

2981991893 is a wasteful number, since it uses less digits than its factorization.

2981991893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676.

The product of its digits is 2519424, while the sum is 59.

The square root of 2981991893 is about 54607.6175363841. The cubic root of 2981991893 is about 1439.3579784910.

Subtracting 2981991893 from its reverse (3981991892), we obtain a palindrome (999999999).

The spelling of 2981991893 in words is "two billion, nine hundred eighty-one million, nine hundred ninety-one thousand, eight hundred ninety-three".