1001002103809 has 2 divisors, whose sum is σ = 1001002103810. Its totient is φ = 1001002103808.

The previous prime is 1001002103729. The next prime is 1001002103821. The reversal of 1001002103809 is 9083012001001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584770678209 + 416231425600 = 764703^2 + 645160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001002103809 - 2¹³ = 1001002095617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001002103839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500501051904 + 500501051905.

It is an arithmetic number, because the mean of its divisors is an integer number (500501051905).

Almost surely, 2^{1001002103809} is an apocalyptic number.

It is an amenable number.

1001002103809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001002103809 is an equidigital number, since it uses as much as digits as its factorization.

1001002103809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1001002103809 in words is "one trillion, one billion, two million, one hundred three thousand, eight hundred nine".