1191187 has 2 divisors, whose sum is σ = 1191188. Its totient is φ = 1191186.

The previous prime is 1191163. The next prime is 1191191. The reversal of 1191187 is 7811911.

It is a strong prime.

It is an emirp because it is prime and its reverse (7811911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191187 - 2¹⁵ = 1158419 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1191107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595593 + 595594.

It is an arithmetic number, because the mean of its divisors is an integer number (595594).

2^1191187 is an apocalyptic number.

1191187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191187 is an equidigital number, since it uses as much as digits as its factorization.

1191187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 28.

The square root of 1191187 is about 1091.4151364169. The cubic root of 1191187 is about 106.0050727369.

It can be divided in two parts, 1191 and 187, that added together give a triangular number (1378 = T₅₂).

The spelling of 1191187 in words is "one million, one hundred ninety-one thousand, one hundred eighty-seven".