1169991 has 16 divisors (see below), whose sum is σ = 1836000. Its totient is φ = 733824.

The previous prime is 1169939. The next prime is 1170007. The reversal of 1169991 is 1999611.

It is not a de Polignac number, because 1169991 - 2¹⁹ = 645703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1169191) 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 in 15 ways as a sum of consecutive naturals, for example, 816 + ... + 1733.

It is an arithmetic number, because the mean of its divisors is an integer number (114750).

2^1169991 is an apocalyptic number.

1169991 is a deficient number, since it is larger than the sum of its proper divisors (666009).

1169991 is a wasteful number, since it uses less digits than its factorization.

1169991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2569 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 1169991 is about 1081.6612223797. The cubic root of 1169991 is about 105.3725541155.

The spelling of 1169991 in words is "one million, one hundred sixty-nine thousand, nine hundred ninety-one".