196387109 has 2 divisors, whose sum is σ = 196387110. Its totient is φ = 196387108.

The previous prime is 196387099. The next prime is 196387141. The reversal of 196387109 is 901783691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146289025 + 50098084 = 12095^2 + 7078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196387109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196387109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196384109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98193554 + 98193555.

It is an arithmetic number, because the mean of its divisors is an integer number (98193555).

Almost surely, 2^196387109 is an apocalyptic number.

It is an amenable number.

196387109 is a deficient number, since it is larger than the sum of its proper divisors (1).

196387109 is an equidigital number, since it uses as much as digits as its factorization.

196387109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 196387109 is about 14013.8185017503. The cubic root of 196387109 is about 581.2607424846.

The spelling of 196387109 in words is "one hundred ninety-six million, three hundred eighty-seven thousand, one hundred nine".