6011991 has 6 divisors (see below), whose sum is σ = 8684000. Its totient is φ = 4007988.

The previous prime is 6011969. The next prime is 6012011. The reversal of 6011991 is 1991106.

It is not a de Polignac number, because 6011991 - 2¹⁰ = 6010967 is a prime.

It is a super-2 number, since 2×6011991² = 72288071568162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6011491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333991 + ... + 334008.

Almost surely, 2^6011991 is an apocalyptic number.

6011991 is a deficient number, since it is larger than the sum of its proper divisors (2672009).

6011991 is a wasteful number, since it uses less digits than its factorization.

6011991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668005 (or 668002 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 6011991 is about 2451.9361737207. The cubic root of 6011991 is about 181.8330292496.

The spelling of 6011991 in words is "six million, eleven thousand, nine hundred ninety-one".