196979989 has 2 divisors, whose sum is σ = 196979990. Its totient is φ = 196979988.

The previous prime is 196979917. The next prime is 196980023. The reversal of 196979989 is 989979691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168143089 + 28836900 = 12967^2 + 5370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196979989 is a prime.

It is a super-2 number, since 2×196979989² = 77602232132880242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196979389) 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, 98489994 + 98489995.

It is an arithmetic number, because the mean of its divisors is an integer number (98489995).

Almost surely, 2^196979989 is an apocalyptic number.

It is an amenable number.

196979989 is a deficient number, since it is larger than the sum of its proper divisors (1).

196979989 is an equidigital number, since it uses as much as digits as its factorization.

196979989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 67.

The square root of 196979989 is about 14034.9559671557. The cubic root of 196979989 is about 581.8450843969.

The spelling of 196979989 in words is "one hundred ninety-six million, nine hundred seventy-nine thousand, nine hundred eighty-nine".