2009201009 has 4 divisors (see below), whose sum is σ = 2047110516. Its totient is φ = 1971291504.

The previous prime is 2009200993. The next prime is 2009201011. The reversal of 2009201009 is 9001029002.

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 926593600 + 1082607409 = 30440^2 + 32903^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009201009 - 2⁴ = 2009200993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2009201059) 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 3 ways as a sum of consecutive naturals, for example, 18954674 + ... + 18954779.

It is an arithmetic number, because the mean of its divisors is an integer number (511777629).

Almost surely, 2^2009201009 is an apocalyptic number.

It is an amenable number.

2009201009 is a deficient number, since it is larger than the sum of its proper divisors (37909507).

2009201009 is an equidigital number, since it uses as much as digits as its factorization.

2009201009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37909506.

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

The square root of 2009201009 is about 44824.1119153520. Note that the first 3 decimals coincide. The cubic root of 2009201009 is about 1261.8501854000.

The spelling of 2009201009 in words is "two billion, nine million, two hundred one thousand, nine".