2001202109 has 2 divisors, whose sum is σ = 2001202110. Its totient is φ = 2001202108.

The previous prime is 2001202067. The next prime is 2001202111. The reversal of 2001202109 is 9012021002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971804025 + 29398084 = 44405^2 + 5422^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001202109 - 2¹² = 2001198013 is a prime.

Together with 2001202111, 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 (2001202199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000601054 + 1000601055.

It is an arithmetic number, because the mean of its divisors is an integer number (1000601055).

Almost surely, 2^2001202109 is an apocalyptic number.

It is an amenable number.

2001202109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001202109 is an equidigital number, since it uses as much as digits as its factorization.

2001202109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2001202109 is about 44734.7975182631. The cubic root of 2001202109 is about 1260.1734264098.

The spelling of 2001202109 in words is "two billion, one million, two hundred two thousand, one hundred nine".