200491209 has 12 divisors (see below), whose sum is σ = 295063236. Its totient is φ = 131138592.

The previous prime is 200491171. The next prime is 200491223. The reversal of 200491209 is 902194002.

200491209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 76947984 + 123543225 = 8772^2 + 11115^2 .

It is not a de Polignac number, because 200491209 - 2²⁷ = 66273481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200491289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209682 + ... + 210635.

It is an arithmetic number, because the mean of its divisors is an integer number (24588603).

Almost surely, 2^200491209 is an apocalyptic number.

It is an amenable number.

200491209 is a deficient number, since it is larger than the sum of its proper divisors (94572027).

200491209 is a wasteful number, since it uses less digits than its factorization.

200491209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420376 (or 420373 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 200491209 is about 14159.4918341020. The cubic root of 200491209 is about 585.2819241610.

The spelling of 200491209 in words is "two hundred million, four hundred ninety-one thousand, two hundred nine".