6209991613 has 4 divisors (see below), whose sum is σ = 7097133280. Its totient is φ = 5322849948.

The previous prime is 6209991611. The next prime is 6209991617. The reversal of 6209991613 is 3161999026.

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 6209991613 - 2¹ = 6209991611 is a prime.

It is the 78804-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6209991611) by changing a digit.

It is a nontrivial repunit in base 78803.

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, 443570823 + ... + 443570836.

It is an arithmetic number, because the mean of its divisors is an integer number (1774283320).

Almost surely, 2^6209991613 is an apocalyptic number.

It is an amenable number.

6209991613 is a deficient number, since it is larger than the sum of its proper divisors (887141667).

6209991613 is an equidigital number, since it uses as much as digits as its factorization.

6209991613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887141666.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 6209991613 is about 78803.5000047587. The cubic root of 6209991613 is about 1838.0768750879.

The spelling of 6209991613 in words is "six billion, two hundred nine million, nine hundred ninety-one thousand, six hundred thirteen".