1909001919001 has 4 divisors (see below), whose sum is σ = 1909007639604. Its totient is φ = 1908996198400.

The previous prime is 1909001918981. The next prime is 1909001919007. The reversal of 1909001919001 is 1009191009091.

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 1474293782025 + 434708136976 = 1214205^2 + 659324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909001919001 - 2²¹ = 1908999821849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909001919007) 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, 2326540 + ... + 3038221.

It is an arithmetic number, because the mean of its divisors is an integer number (477251909901).

Almost surely, 2^{1909001919001} is an apocalyptic number.

It is an amenable number.

1909001919001 is a deficient number, since it is larger than the sum of its proper divisors (5720603).

1909001919001 is an equidigital number, since it uses as much as digits as its factorization.

1909001919001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720602.

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 1909001919001 in words is "one trillion, nine hundred nine billion, one million, nine hundred nineteen thousand, one".