1191149 has 2 divisors, whose sum is σ = 1191150. Its totient is φ = 1191148.

The previous prime is 1191131. The next prime is 1191163. The reversal of 1191149 is 9411911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 13924 = 1085^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191149 - 2²⁰ = 142573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191109) 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 as a sum of consecutive naturals, namely, 595574 + 595575.

It is an arithmetic number, because the mean of its divisors is an integer number (595575).

2^1191149 is an apocalyptic number.

It is an amenable number.

1191149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191149 is an equidigital number, since it uses as much as digits as its factorization.

1191149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 26.

The square root of 1191149 is about 1091.3977276868. The cubic root of 1191149 is about 106.0039455040.

The spelling of 1191149 in words is "one million, one hundred ninety-one thousand, one hundred forty-nine".