200642209 has 4 divisors (see below), whose sum is σ = 200682900. Its totient is φ = 200601520.

The previous prime is 200642207. The next prime is 200642219. The reversal of 200642209 is 902246002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45265984 + 155376225 = 6728^2 + 12465^2 .

It is a cyclic number.

It is not a de Polignac number, because 200642209 - 2¹ = 200642207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200642207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11734 + ... + 23215.

It is an arithmetic number, because the mean of its divisors is an integer number (50170725).

Almost surely, 2^200642209 is an apocalyptic number.

It is an amenable number.

200642209 is a deficient number, since it is larger than the sum of its proper divisors (40691).

200642209 is an equidigital number, since it uses as much as digits as its factorization.

200642209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40690.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 200642209 is about 14164.8229427692. The cubic root of 200642209 is about 585.4288223602.

The spelling of 200642209 in words is "two hundred million, six hundred forty-two thousand, two hundred nine".