11181091 has 2 divisors, whose sum is σ = 11181092. Its totient is φ = 11181090.

The previous prime is 11181089. The next prime is 11181103. The reversal of 11181091 is 19018111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11181091 - 2¹ = 11181089 is a prime.

Together with 11181089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11181061) 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, 5590545 + 5590546.

It is an arithmetic number, because the mean of its divisors is an integer number (5590546).

Almost surely, 2^11181091 is an apocalyptic number.

11181091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181091 is an equidigital number, since it uses as much as digits as its factorization.

11181091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The square root of 11181091 is about 3343.8138405121. The cubic root of 11181091 is about 223.6118050545.

It can be divided in two parts, 1118 and 1091, that added together give a square (2209 = 47²).

The spelling of 11181091 in words is "eleven million, one hundred eighty-one thousand, ninety-one".