200661309 has 6 divisors (see below), whose sum is σ = 289844126. Its totient is φ = 133774200.

The previous prime is 200661239. The next prime is 200661311. The reversal of 200661309 is 903166002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 190357209 + 10304100 = 13797^2 + 3210^2 .

It is a de Polignac number, because none of the positive numbers 2^k-200661309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200661709) 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 in 5 ways as a sum of consecutive naturals, for example, 11147842 + ... + 11147859.

Almost surely, 2^200661309 is an apocalyptic number.

It is an amenable number.

200661309 is a deficient number, since it is larger than the sum of its proper divisors (89182817).

200661309 is a wasteful number, since it uses less digits than its factorization.

200661309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22295707 (or 22295704 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 200661309 is about 14165.4971321165. The cubic root of 200661309 is about 585.4473982716.

The spelling of 200661309 in words is "two hundred million, six hundred sixty-one thousand, three hundred nine".