11721187 has 2 divisors, whose sum is σ = 11721188. Its totient is φ = 11721186.

The previous prime is 11721169. The next prime is 11721209. The reversal of 11721187 is 78112711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11721187 - 2¹¹ = 11719139 is a prime.

It is not a weakly prime, because it can be changed into another prime (11721107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860593 + 5860594.

It is an arithmetic number, because the mean of its divisors is an integer number (5860594).

Almost surely, 2^11721187 is an apocalyptic number.

11721187 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721187 is an equidigital number, since it uses as much as digits as its factorization.

11721187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784, while the sum is 28.

The square root of 11721187 is about 3423.6219125365. The cubic root of 11721187 is about 227.1558181607.

Adding to 11721187 its reverse (78112711), we get a palindrome (89833898).

The spelling of 11721187 in words is "eleven million, seven hundred twenty-one thousand, one hundred eighty-seven".