591666 has 16 divisors (see below), whose sum is σ = 1221888. Its totient is φ = 190800.

The previous prime is 591659. The next prime is 591673. The reversal of 591666 is 666195.

It is an interprime number because it is at equal distance from previous prime (591659) and next prime (591673).

It is a Curzon number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 591666.

It is an unprimeable number.

591666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (76368).

2⁵⁹¹⁶⁶⁶ is an apocalyptic number.

591666 is an abundant number, since it is smaller than the sum of its proper divisors (630222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

591666 is a wasteful number, since it uses less digits than its factorization.

591666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217.

The product of its digits is 9720, while the sum is 33.

The square root of 591666 is about 769.1982839294. The cubic root of 591666 is about 83.9509350653.

Subtracting 591666 from its reverse (666195), we obtain a square (74529 = 273²).

The spelling of 591666 in words is "five hundred ninety-one thousand, six hundred sixty-six".