1001909181909 has 4 divisors (see below), whose sum is σ = 1335878909216. Its totient is φ = 667939454604.

The previous prime is 1001909181887. The next prime is 1001909181941. The reversal of 1001909181909 is 9091819091001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1001909181909 - 2⁵ = 1001909181877 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 (1001909182909) 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, 166984863649 + ... + 166984863654.

It is an arithmetic number, because the mean of its divisors is an integer number (333969727304).

Almost surely, 2^{1001909181909} is an apocalyptic number.

It is an amenable number.

1001909181909 is a deficient number, since it is larger than the sum of its proper divisors (333969727307).

1001909181909 is an equidigital number, since it uses as much as digits as its factorization.

1001909181909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333969727306.

The product of its (nonzero) digits is 52488, while the sum is 48.

The spelling of 1001909181909 in words is "one trillion, one billion, nine hundred nine million, one hundred eighty-one thousand, nine hundred nine".