2017742809 has 4 divisors (see below), whose sum is σ = 2024231040. Its totient is φ = 2011254580.

The previous prime is 2017742743. The next prime is 2017742819. The reversal of 2017742809 is 9082477102.

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 a cyclic number.

It is not a de Polignac number, because 2017742809 - 2¹³ = 2017734617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2017742819) 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, 3243649 + ... + 3244270.

It is an arithmetic number, because the mean of its divisors is an integer number (506057760).

Almost surely, 2^2017742809 is an apocalyptic number.

It is an amenable number.

2017742809 is a deficient number, since it is larger than the sum of its proper divisors (6488231).

2017742809 is an equidigital number, since it uses as much as digits as its factorization.

2017742809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6488230.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2017742809 is about 44919.2921694009. The cubic root of 2017742809 is about 1263.6358427363.

The spelling of 2017742809 in words is "two billion, seventeen million, seven hundred forty-two thousand, eight hundred nine".