12091291 has 2 divisors, whose sum is σ = 12091292. Its totient is φ = 12091290.

The previous prime is 12091259. The next prime is 12091297. The reversal of 12091291 is 19219021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12091291 - 2⁵ = 12091259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12091297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6045645 + 6045646.

It is an arithmetic number, because the mean of its divisors is an integer number (6045646).

Almost surely, 2^12091291 is an apocalyptic number.

12091291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12091291 is an equidigital number, since it uses as much as digits as its factorization.

12091291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 12091291 is about 3477.2533701184. The cubic root of 12091291 is about 229.5219497299.

It can be divided in two parts, 1209 and 1291, that added together give a square (2500 = 50²).

The spelling of 12091291 in words is "twelve million, ninety-one thousand, two hundred ninety-one".