6005999991 has 4 divisors (see below), whose sum is σ = 8007999992. Its totient is φ = 4003999992.

The previous prime is 6005999983. The next prime is 6006000019. The reversal of 6005999991 is 1999995006.

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

It is not a de Polignac number, because 6005999991 - 2³ = 6005999983 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 (6005999971) 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, 1000999996 + ... + 1001000001.

It is an arithmetic number, because the mean of its divisors is an integer number (2001999998).

Almost surely, 2^6005999991 is an apocalyptic number.

6005999991 is a deficient number, since it is larger than the sum of its proper divisors (2002000001).

6005999991 is a wasteful number, since it uses less digits than its factorization.

6005999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002000000.

The product of its (nonzero) digits is 1771470, while the sum is 57.

The square root of 6005999991 is about 77498.3870219245. The cubic root of 6005999991 is about 1817.7260969983.

The spelling of 6005999991 in words is "six billion, five million, nine hundred ninety-nine thousand, nine hundred ninety-one".