201445609 has 2 divisors, whose sum is σ = 201445610. Its totient is φ = 201445608.

The previous prime is 201445507. The next prime is 201445663. The reversal of 201445609 is 906544102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139901584 + 61544025 = 11828^2 + 7845^2 .

It is a cyclic number.

It is not a de Polignac number, because 201445609 - 2¹⁷ = 201314537 is a prime.

It is not a weakly prime, because it can be changed into another prime (201442609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100722804 + 100722805.

It is an arithmetic number, because the mean of its divisors is an integer number (100722805).

Almost surely, 2^201445609 is an apocalyptic number.

It is an amenable number.

201445609 is a deficient number, since it is larger than the sum of its proper divisors (1).

201445609 is an equidigital number, since it uses as much as digits as its factorization.

201445609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 201445609 is about 14193.1535960124. The cubic root of 201445609 is about 586.2091619012.

The spelling of 201445609 in words is "two hundred one million, four hundred forty-five thousand, six hundred nine".