196145309 has 2 divisors, whose sum is σ = 196145310. Its totient is φ = 196145308.

The previous prime is 196145297. The next prime is 196145377. The reversal of 196145309 is 903541691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146047225 + 50098084 = 12085^2 + 7078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196145309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196105309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98072654 + 98072655.

It is an arithmetic number, because the mean of its divisors is an integer number (98072655).

Almost surely, 2^196145309 is an apocalyptic number.

It is an amenable number.

196145309 is a deficient number, since it is larger than the sum of its proper divisors (1).

196145309 is an equidigital number, since it uses as much as digits as its factorization.

196145309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 196145309 is about 14005.1886456413. The cubic root of 196145309 is about 581.0220870200.

The spelling of 196145309 in words is "one hundred ninety-six million, one hundred forty-five thousand, three hundred nine".