2991136639 has 4 divisors (see below), whose sum is σ = 3014689024. Its totient is φ = 2967584256.

The previous prime is 2991136627. The next prime is 2991136651. The reversal of 2991136639 is 9366311992.

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

It is an interprime number because it is at equal distance from previous prime (2991136627) and next prime (2991136651).

It is a cyclic number.

It is not a de Polignac number, because 2991136639 - 2⁵ = 2991136607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2991136592 and 2991136601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991136619) 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 3 ways as a sum of consecutive naturals, for example, 11776002 + ... + 11776255.

It is an arithmetic number, because the mean of its divisors is an integer number (753672256).

Almost surely, 2^2991136639 is an apocalyptic number.

2991136639 is a deficient number, since it is larger than the sum of its proper divisors (23552385).

2991136639 is a wasteful number, since it uses less digits than its factorization.

2991136639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23552384.

The product of its digits is 472392, while the sum is 49.

The square root of 2991136639 is about 54691.2848541703. The cubic root of 2991136639 is about 1440.8278160407.

The spelling of 2991136639 in words is "two billion, nine hundred ninety-one million, one hundred thirty-six thousand, six hundred thirty-nine".