196619989 has 2 divisors, whose sum is σ = 196619990. Its totient is φ = 196619988.

The previous prime is 196619981. The next prime is 196619993. The reversal of 196619989 is 989916691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196280100 + 339889 = 14010^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 196619989 - 2³ = 196619981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196619981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98309994 + 98309995.

It is an arithmetic number, because the mean of its divisors is an integer number (98309995).

Almost surely, 2^196619989 is an apocalyptic number.

It is an amenable number.

196619989 is a deficient number, since it is larger than the sum of its proper divisors (1).

196619989 is an equidigital number, since it uses as much as digits as its factorization.

196619989 is an evil number, because the sum of its binary digits is even.

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

The square root of 196619989 is about 14022.1249816139. The cubic root of 196619989 is about 581.4904088339.

The spelling of 196619989 in words is "one hundred ninety-six million, six hundred nineteen thousand, nine hundred eighty-nine".