196812989 has 2 divisors, whose sum is σ = 196812990. Its totient is φ = 196812988.

The previous prime is 196812983. The next prime is 196813013. The reversal of 196812989 is 989218691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186540964 + 10272025 = 13658^2 + 3205^2 .

It is an emirp because it is prime and its reverse (989218691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196812989 is a prime.

It is a super-2 number, since 2×196812989² = 77470705278228242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196812989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196812983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98406494 + 98406495.

It is an arithmetic number, because the mean of its divisors is an integer number (98406495).

Almost surely, 2^196812989 is an apocalyptic number.

It is an amenable number.

196812989 is a deficient number, since it is larger than the sum of its proper divisors (1).

196812989 is an equidigital number, since it uses as much as digits as its factorization.

196812989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 53.

The square root of 196812989 is about 14029.0052747869. The cubic root of 196812989 is about 581.6806081265.

The spelling of 196812989 in words is "one hundred ninety-six million, eight hundred twelve thousand, nine hundred eighty-nine".