202009109 has 2 divisors, whose sum is σ = 202009110. Its totient is φ = 202009108.

The previous prime is 202009063. The next prime is 202009111. The reversal of 202009109 is 901900202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119290084 + 82719025 = 10922^2 + 9095^2 .

It is a cyclic number.

It is not a de Polignac number, because 202009109 - 2²⁰ = 200960533 is a prime.

Together with 202009111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202009169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101004554 + 101004555.

It is an arithmetic number, because the mean of its divisors is an integer number (101004555).

Almost surely, 2^202009109 is an apocalyptic number.

It is an amenable number.

202009109 is a deficient number, since it is larger than the sum of its proper divisors (1).

202009109 is an equidigital number, since it uses as much as digits as its factorization.

202009109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 202009109 is about 14212.9908534411. The cubic root of 202009109 is about 586.7552503045.

The spelling of 202009109 in words is "two hundred two million, nine thousand, one hundred nine".