1161091 has 2 divisors, whose sum is σ = 1161092. Its totient is φ = 1161090.

The previous prime is 1161077. The next prime is 1161101. The reversal of 1161091 is 1901611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1161091 - 2⁵ = 1161059 is a prime.

It is a Chen prime.

1161091 is a lucky number.

It is equal to p₉₀₁₀₉ and since 1161091 and 90109 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1161001) 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, 580545 + 580546.

It is an arithmetic number, because the mean of its divisors is an integer number (580546).

2^1161091 is an apocalyptic number.

1161091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161091 is an equidigital number, since it uses as much as digits as its factorization.

1161091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1161091 is about 1077.5393264285. The cubic root of 1161091 is about 105.1046877280.

The spelling of 1161091 in words is "one million, one hundred sixty-one thousand, ninety-one".