12000991 has 4 divisors (see below), whose sum is σ = 12008152. Its totient is φ = 11993832.

The previous prime is 12000979. The next prime is 12001001. The reversal of 12000991 is 19900021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12000991 - 2⁵ = 12000959 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 (12000931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (3002038).

Almost surely, 2^12000991 is an apocalyptic number.

12000991 is a deficient number, since it is larger than the sum of its proper divisors (7161).

12000991 is an equidigital number, since it uses as much as digits as its factorization.

12000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 12000991 is about 3464.2446507139. The cubic root of 12000991 is about 228.9491506250.

The spelling of 12000991 in words is "twelve million, nine hundred ninety-one", and thus it is an aban number.