196699981 has 2 divisors, whose sum is σ = 196699982. Its totient is φ = 196699980.

The previous prime is 196699963. The next prime is 196700113. The reversal of 196699981 is 189996691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150921225 + 45778756 = 12285^2 + 6766^2 .

It is a cyclic number.

It is not a de Polignac number, because 196699981 - 2²¹ = 194602829 is a prime.

It is a super-2 number, since 2×196699981² = 77381765050800722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196699901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98349990 + 98349991.

It is an arithmetic number, because the mean of its divisors is an integer number (98349991).

Almost surely, 2^196699981 is an apocalyptic number.

It is an amenable number.

196699981 is a deficient number, since it is larger than the sum of its proper divisors (1).

196699981 is an equidigital number, since it uses as much as digits as its factorization.

196699981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 58.

The square root of 196699981 is about 14024.9770409794. The cubic root of 196699981 is about 581.5692551311.

The spelling of 196699981 in words is "one hundred ninety-six million, six hundred ninety-nine thousand, nine hundred eighty-one".