202009009 has 4 divisors (see below), whose sum is σ = 206936100. Its totient is φ = 197081920.

The previous prime is 202009001. The next prime is 202009019. The reversal of 202009009 is 900900202.

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 74770609 + 127238400 = 8647^2 + 11280^2 .

It is a cyclic number.

It is not a de Polignac number, because 202009009 - 2³ = 202009001 is a prime.

It is a Duffinian number.

202009009 is a modest number, since divided by 9009 gives 202 as remainder.

It is not an unprimeable number, because it can be changed into a prime (202009001) 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, 2463484 + ... + 2463565.

It is an arithmetic number, because the mean of its divisors is an integer number (51734025).

Almost surely, 2^202009009 is an apocalyptic number.

It is an amenable number.

202009009 is a deficient number, since it is larger than the sum of its proper divisors (4927091).

202009009 is an equidigital number, since it uses as much as digits as its factorization.

202009009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927090.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 202009009 is about 14212.9873355322. The cubic root of 202009009 is about 586.7551534845.

The spelling of 202009009 in words is "two hundred two million, nine thousand, nine".