1166891 has 8 divisors (see below), whose sum is σ = 1303104. Its totient is φ = 1035720.

The previous prime is 1166861. The next prime is 1166903. The reversal of 1166891 is 1986611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1166891 - 2⁶ = 1166827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166801) 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 7 ways as a sum of consecutive naturals, for example, 761 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (162888).

2^1166891 is an apocalyptic number.

1166891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1166891 is a deficient number, since it is larger than the sum of its proper divisors (136213).

1166891 is a wasteful number, since it uses less digits than its factorization.

1166891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521.

The product of its digits is 2592, while the sum is 32.

The square root of 1166891 is about 1080.2272908976. The cubic root of 1166891 is about 105.2794070047.

It can be divided in two parts, 116 and 6891, that added together give a palindrome (7007).

The spelling of 1166891 in words is "one million, one hundred sixty-six thousand, eight hundred ninety-one".