1189091 has 4 divisors (see below), whose sum is σ = 1200312. Its totient is φ = 1177872.

The previous prime is 1189063. The next prime is 1189093. The reversal of 1189091 is 1909811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1189091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5450 + ... + 5663.

It is an arithmetic number, because the mean of its divisors is an integer number (300078).

2^1189091 is an apocalyptic number.

1189091 is a deficient number, since it is larger than the sum of its proper divisors (11221).

1189091 is a wasteful number, since it uses less digits than its factorization.

1189091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11220.

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

The square root of 1189091 is about 1090.4544924021. The cubic root of 1189091 is about 105.9428611001.

The spelling of 1189091 in words is "one million, one hundred eighty-nine thousand, ninety-one".