196591 has 4 divisors (see below), whose sum is σ = 203400. Its totient is φ = 189784.

The previous prime is 196583. The next prime is 196597. The reversal of 196591 is 195691.

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 196591 - 2³ = 196583 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196597) 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, 3361 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (50850).

2¹⁹⁶⁵⁹¹ is an apocalyptic number.

196591 is a deficient number, since it is larger than the sum of its proper divisors (6809).

196591 is an equidigital number, since it uses as much as digits as its factorization.

196591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808.

The product of its digits is 2430, while the sum is 31.

The square root of 196591 is about 443.3858364901. The cubic root of 196591 is about 58.1461829756.

Subtracting from 196591 its reverse (195691), we obtain a square (900 = 30²).

It can be divided in two parts, 196 and 591, that added together give a palindrome (787).

The spelling of 196591 in words is "one hundred ninety-six thousand, five hundred ninety-one".