11866191 has 8 divisors (see below), whose sum is σ = 16367280. Its totient is φ = 7637952.

The previous prime is 11866181. The next prime is 11866199. The reversal of 11866191 is 19166811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11866191 - 2¹³ = 11857999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68110 + ... + 68283.

It is an arithmetic number, because the mean of its divisors is an integer number (2045910).

Almost surely, 2^11866191 is an apocalyptic number.

11866191 is a deficient number, since it is larger than the sum of its proper divisors (4501089).

11866191 is a wasteful number, since it uses less digits than its factorization.

11866191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136425.

The product of its digits is 2592, while the sum is 33.

The square root of 11866191 is about 3444.7338068420. The cubic root of 11866191 is about 228.0887043275.

The spelling of 11866191 in words is "eleven million, eight hundred sixty-six thousand, one hundred ninety-one".