1166591 has 8 divisors (see below), whose sum is σ = 1245744. Its totient is φ = 1088640.

The previous prime is 1166579. The next prime is 1166597. The reversal of 1166591 is 1956611.

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 1166591 - 2⁶ = 1166527 is a prime.

It is a super-2 number, since 2×1166591² = 2721869122562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2561 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (155718).

2^1166591 is an apocalyptic number.

1166591 is a deficient number, since it is larger than the sum of its proper divisors (79153).

1166591 is a wasteful number, since it uses less digits than its factorization.

1166591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 1620, while the sum is 29.

The square root of 1166591 is about 1080.0884223062. The cubic root of 1166591 is about 105.2703840171.

The spelling of 1166591 in words is "one million, one hundred sixty-six thousand, five hundred ninety-one".