1089191 has 2 divisors, whose sum is σ = 1089192. Its totient is φ = 1089190.

The previous prime is 1089161. The next prime is 1089197. The reversal of 1089191 is 1919801.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1616801 and 1086161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089191 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089197) 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, 544595 + 544596.

It is an arithmetic number, because the mean of its divisors is an integer number (544596).

2^1089191 is an apocalyptic number.

1089191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089191 is an equidigital number, since it uses as much as digits as its factorization.

1089191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1089191 is about 1043.6431382422. The cubic root of 1089191 is about 102.8887793079. Note that the first 3 decimals are identical.

The spelling of 1089191 in words is "one million, eighty-nine thousand, one hundred ninety-one".