6003991 has 4 divisors (see below), whose sum is σ = 6861712. Its totient is φ = 5146272.

The previous prime is 6003983. The next prime is 6003997. The reversal of 6003991 is 1993006.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6003991 - 2³ = 6003983 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 (6003997) 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, 428850 + ... + 428863.

It is an arithmetic number, because the mean of its divisors is an integer number (1715428).

Almost surely, 2^6003991 is an apocalyptic number.

6003991 is a deficient number, since it is larger than the sum of its proper divisors (857721).

6003991 is an equidigital number, since it uses as much as digits as its factorization.

6003991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857720.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 6003991 is about 2450.3042668208. The cubic root of 6003991 is about 181.7523399550.

Adding to 6003991 its reverse (1993006), we get a palindrome (7996997).

The spelling of 6003991 in words is "six million, three thousand, nine hundred ninety-one".