12005091 has 40 divisors (see below), whose sum is σ = 21187584. Its totient is φ = 6629040.

The previous prime is 12005053. The next prime is 12005099. The reversal of 12005091 is 19050021.

It is not a de Polignac number, because 12005091 - 2⁷ = 12004963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12005099) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17236 + ... + 17918.

Almost surely, 2^12005091 is an apocalyptic number.

12005091 is a deficient number, since it is larger than the sum of its proper divisors (9182493).

12005091 is an equidigital number, since it uses as much as digits as its factorization.

12005091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 12005091 is about 3464.8363597723. The cubic root of 12005091 is about 228.9752202677.

The spelling of 12005091 in words is "twelve million, five thousand, ninety-one".