1166881 has 4 divisors (see below), whose sum is σ = 1169200. Its totient is φ = 1164564.

The previous prime is 1166861. The next prime is 1166903. The reversal of 1166881 is 1886611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1166881 - 2⁵ = 1166849 is a prime.

It is a super-2 number, since 2×1166881² = 2723222536322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166801) 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, 51 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (292300).

2^1166881 is an apocalyptic number.

It is an amenable number.

1166881 is a deficient number, since it is larger than the sum of its proper divisors (2319).

1166881 is an equidigital number, since it uses as much as digits as its factorization.

1166881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318.

The product of its digits is 2304, while the sum is 31.

The square root of 1166881 is about 1080.2226622322. Note that the first 3 decimals coincide. The cubic root of 1166881 is about 105.2791062634.

The spelling of 1166881 in words is "one million, one hundred sixty-six thousand, eight hundred eighty-one".