201245309 has 2 divisors, whose sum is σ = 201245310. Its totient is φ = 201245308.

The previous prime is 201245299. The next prime is 201245339. The reversal of 201245309 is 903542102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183521209 + 17724100 = 13547^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 201245309 - 2⁸ = 201245053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201245339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100622654 + 100622655.

It is an arithmetic number, because the mean of its divisors is an integer number (100622655).

Almost surely, 2^201245309 is an apocalyptic number.

It is an amenable number.

201245309 is a deficient number, since it is larger than the sum of its proper divisors (1).

201245309 is an equidigital number, since it uses as much as digits as its factorization.

201245309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 201245309 is about 14186.0956221224. The cubic root of 201245309 is about 586.0148056613.

The spelling of 201245309 in words is "two hundred one million, two hundred forty-five thousand, three hundred nine".