1002001202109 has 6 divisors (see below), whose sum is σ = 1447335069726. Its totient is φ = 668000801400.

The previous prime is 1002001201969. The next prime is 1002001202131. The reversal of 1002001202109 is 9012021002001.

It can be written as a sum of positive squares in only one way, i.e., 1001660688900 + 340513209 = 1000830^2 + 18453^2 .

It is not a de Polignac number, because 1002001202109 - 2¹⁶ = 1002001136573 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1002001202091 and 1002001202100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002001202149) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55666733442 + ... + 55666733459.

It is an arithmetic number, because the mean of its divisors is an integer number (241222511621).

Almost surely, 2^{1002001202109} is an apocalyptic number.

It is an amenable number.

1002001202109 is a deficient number, since it is larger than the sum of its proper divisors (445333867617).

1002001202109 is a wasteful number, since it uses less digits than its factorization.

1002001202109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111333466907 (or 111333466904 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 1002001202109 in words is "one trillion, two billion, one million, two hundred two thousand, one hundred nine".