1166291 has 4 divisors (see below), whose sum is σ = 1332912. Its totient is φ = 999672.

The previous prime is 1166287. The next prime is 1166311. The reversal of 1166291 is 1926611.

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

It is a cyclic number.

It is not a de Polignac number, because 1166291 - 2² = 1166287 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1166291.

It is not an unprimeable number, because it can be changed into a prime (1156291) 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, 83300 + ... + 83313.

It is an arithmetic number, because the mean of its divisors is an integer number (333228).

2^1166291 is an apocalyptic number.

1166291 is a deficient number, since it is larger than the sum of its proper divisors (166621).

1166291 is an equidigital number, since it uses as much as digits as its factorization.

1166291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166620.

The product of its digits is 648, while the sum is 26.

The square root of 1166291 is about 1079.9495358580. The cubic root of 1166291 is about 105.2613594824.

The spelling of 1166291 in words is "one million, one hundred sixty-six thousand, two hundred ninety-one".