102001001909 has 4 divisors (see below), whose sum is σ = 102003309804. Its totient is φ = 101998694016.

The previous prime is 102001001903. The next prime is 102001001911. The reversal of 102001001909 is 909100100201.

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 66798987025 + 35202014884 = 258455^2 + 187622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102001001909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001001903) 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, 1086332 + ... + 1176485.

It is an arithmetic number, because the mean of its divisors is an integer number (25500827451).

Almost surely, 2^102001001909 is an apocalyptic number.

It is an amenable number.

102001001909 is a deficient number, since it is larger than the sum of its proper divisors (2307895).

102001001909 is an equidigital number, since it uses as much as digits as its factorization.

102001001909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307894.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 102001001909 in words is "one hundred two billion, one million, one thousand, nine hundred nine".