196681 has 2 divisors, whose sum is σ = 196682. Its totient is φ = 196680.

The previous prime is 196663. The next prime is 196687. The reversal of 196681 is 186691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 67081 = 360^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 196681 - 2⁹ = 196169 is a prime.

It is a super-2 number, since 2×196681² = 77366831522, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (196687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98340 + 98341.

It is an arithmetic number, because the mean of its divisors is an integer number (98341).

2¹⁹⁶⁶⁸¹ is an apocalyptic number.

It is an amenable number.

196681 is a deficient number, since it is larger than the sum of its proper divisors (1).

196681 is an equidigital number, since it uses as much as digits as its factorization.

196681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 196681 is about 443.4873166168. The cubic root of 196681 is about 58.1550547925.

The spelling of 196681 in words is "one hundred ninety-six thousand, six hundred eighty-one".