196981 has 4 divisors (see below), whose sum is σ = 197964. Its totient is φ = 196000.

The previous prime is 196961. The next prime is 196991. The reversal of 196981 is 189691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 44100 = 391^2 + 210^2 .

It is a 3-Lehmer number, since φ(196981) divides (196981-1)³.

It is a cyclic number.

It is not a de Polignac number, because 196981 - 2⁷ = 196853 is a prime.

It is a super-2 number, since 2×196981² = 77603028722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196901) 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, 70 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (49491).

2¹⁹⁶⁹⁸¹ is an apocalyptic number.

196981 is the 281-st heptagonal number.

It is an amenable number.

196981 is a deficient number, since it is larger than the sum of its proper divisors (983).

196981 is an equidigital number, since it uses as much as digits as its factorization.

196981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982.

The product of its digits is 3888, while the sum is 34.

The square root of 196981 is about 443.8254161267. The cubic root of 196981 is about 58.1846079835.

The spelling of 196981 in words is "one hundred ninety-six thousand, nine hundred eighty-one".