201442609 has 2 divisors, whose sum is σ = 201442610. Its totient is φ = 201442608.

The previous prime is 201442603. The next prime is 201442643. The reversal of 201442609 is 906244102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151782400 + 49660209 = 12320^2 + 7047^2 .

It is a cyclic number.

It is not a de Polignac number, because 201442609 - 2²⁵ = 167888177 is a prime.

It is not a weakly prime, because it can be changed into another prime (201442603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100721304 + 100721305.

It is an arithmetic number, because the mean of its divisors is an integer number (100721305).

Almost surely, 2^201442609 is an apocalyptic number.

It is an amenable number.

201442609 is a deficient number, since it is larger than the sum of its proper divisors (1).

201442609 is an equidigital number, since it uses as much as digits as its factorization.

201442609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 201442609 is about 14193.0479108611. The cubic root of 201442609 is about 586.2062518746.

The spelling of 201442609 in words is "two hundred one million, four hundred forty-two thousand, six hundred nine".