2989997813 has 4 divisors (see below), whose sum is σ = 3261815808. Its totient is φ = 2718179820.

The previous prime is 2989997807. The next prime is 2989997863. The reversal of 2989997813 is 3187999892.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2989997813 - 2⁴ = 2989997797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2989997813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2989997863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135908981 + ... + 135909002.

It is an arithmetic number, because the mean of its divisors is an integer number (815453952).

Almost surely, 2^2989997813 is an apocalyptic number.

It is an amenable number.

2989997813 is a deficient number, since it is larger than the sum of its proper divisors (271817995).

2989997813 is a wasteful number, since it uses less digits than its factorization.

2989997813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271817994.

The product of its digits is 17635968, while the sum is 65.

The square root of 2989997813 is about 54680.8724601208. The cubic root of 2989997813 is about 1440.6449356774.

The spelling of 2989997813 in words is "two billion, nine hundred eighty-nine million, nine hundred ninety-seven thousand, eight hundred thirteen".