1166091 has 4 divisors (see below), whose sum is σ = 1554792. Its totient is φ = 777392.

The previous prime is 1166089. The next prime is 1166093. The reversal of 1166091 is 1906611.

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

It is an interprime number because it is at equal distance from previous prime (1166089) and next prime (1166093).

It is a cyclic number.

It is not a de Polignac number, because 1166091 - 2¹ = 1166089 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1166093) 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, 194346 + ... + 194351.

It is an arithmetic number, because the mean of its divisors is an integer number (388698).

2^1166091 is an apocalyptic number.

1166091 is a deficient number, since it is larger than the sum of its proper divisors (388701).

1166091 is an equidigital number, since it uses as much as digits as its factorization.

1166091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388700.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1166091 is about 1079.8569349687. The cubic root of 1166091 is about 105.2553422662.

The spelling of 1166091 in words is "one million, one hundred sixty-six thousand, ninety-one".