196581 has 32 divisors (see below), whose sum is σ = 350208. Its totient is φ = 95040.

The previous prime is 196579. The next prime is 196583. The reversal of 196581 is 185691.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (196579) and next prime (196583).

It is not a de Polignac number, because 196581 - 2¹ = 196579 is a prime.

It is a super-2 number, since 2×196581² = 77288179122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5295 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (10944).

196581 is a Friedman number, since it can be written as 6*(8^5-9/(1+1)), using all its digits and the basic arithmetic operations.

2¹⁹⁶⁵⁸¹ is an apocalyptic number.

196581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

196581 is a deficient number, since it is larger than the sum of its proper divisors (153627).

196581 is a wasteful number, since it uses less digits than its factorization.

196581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81.

The product of its digits is 2160, while the sum is 30.

The square root of 196581 is about 443.3745594867. The cubic root of 196581 is about 58.1451970510.

It can be divided in two parts, 196 and 581, that added together give a palindrome (777).

The spelling of 196581 in words is "one hundred ninety-six thousand, five hundred eighty-one".