11851291 has 2 divisors, whose sum is σ = 11851292. Its totient is φ = 11851290.

The previous prime is 11851219. The next prime is 11851303. The reversal of 11851291 is 19215811.

Together with previous prime (11851219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (19215811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11851291 is a prime.

It is not a weakly prime, because it can be changed into another prime (11851201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5925645 + 5925646.

It is an arithmetic number, because the mean of its divisors is an integer number (5925646).

Almost surely, 2^11851291 is an apocalyptic number.

11851291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11851291 is an equidigital number, since it uses as much as digits as its factorization.

11851291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 28.

The square root of 11851291 is about 3442.5704059612. The cubic root of 11851291 is about 227.9931964216.

The spelling of 11851291 in words is "eleven million, eight hundred fifty-one thousand, two hundred ninety-one".