1191191 has 2 divisors, whose sum is σ = 1191192. Its totient is φ = 1191190.

The previous prime is 1191187. The next prime is 1191199. The reversal of 1191191 is 1911911.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1911911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191191 - 2² = 1191187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595595 + 595596.

It is an arithmetic number, because the mean of its divisors is an integer number (595596).

2^1191191 is an apocalyptic number.

1191191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191191 is an equidigital number, since it uses as much as digits as its factorization.

1191191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81, while the sum is 23.

The square root of 1191191 is about 1091.4169688987. The cubic root of 1191191 is about 106.0051913916.

The spelling of 1191191 in words is "one million, one hundred ninety-one thousand, one hundred ninety-one".