196518913 has 2 divisors, whose sum is σ = 196518914. Its totient is φ = 196518912.

The previous prime is 196518821. The next prime is 196518943. The reversal of 196518913 is 319815691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196224064 + 294849 = 14008^2 + 543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196518913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196518913.

It is not a weakly prime, because it can be changed into another prime (196518943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98259456 + 98259457.

It is an arithmetic number, because the mean of its divisors is an integer number (98259457).

Almost surely, 2^196518913 is an apocalyptic number.

It is an amenable number.

196518913 is a deficient number, since it is larger than the sum of its proper divisors (1).

196518913 is an equidigital number, since it uses as much as digits as its factorization.

196518913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 43.

The square root of 196518913 is about 14018.5203570134. The cubic root of 196518913 is about 581.3907499282.

The spelling of 196518913 in words is "one hundred ninety-six million, five hundred eighteen thousand, nine hundred thirteen".