11681191 has 2 divisors, whose sum is σ = 11681192. Its totient is φ = 11681190.

The previous prime is 11681183. The next prime is 11681213. The reversal of 11681191 is 19118611.

It is a weak prime.

It is an emirp because it is prime and its reverse (19118611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11681191 - 2³ = 11681183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11681291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5840595 + 5840596.

It is an arithmetic number, because the mean of its divisors is an integer number (5840596).

Almost surely, 2^11681191 is an apocalyptic number.

11681191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11681191 is an equidigital number, since it uses as much as digits as its factorization.

11681191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 28.

The square root of 11681191 is about 3417.7757386932. The cubic root of 11681191 is about 226.8971504554.

The spelling of 11681191 in words is "eleven million, six hundred eighty-one thousand, one hundred ninety-one".