2019540805 has 4 divisors (see below), whose sum is σ = 2423448972. Its totient is φ = 1615632640.

The previous prime is 2019540793. The next prime is 2019540821. The reversal of 2019540805 is 5080459102.

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 1491736129 + 527804676 = 38623^2 + 22974^2 .

It is not a de Polignac number, because 2019540805 - 2⁹ = 2019540293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201954076 + ... + 201954085.

It is an arithmetic number, because the mean of its divisors is an integer number (605862243).

Almost surely, 2^2019540805 is an apocalyptic number.

It is an amenable number.

2019540805 is a deficient number, since it is larger than the sum of its proper divisors (403908167).

2019540805 is an equidigital number, since it uses as much as digits as its factorization.

2019540805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403908166.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 2019540805 is about 44939.3013408086. The cubic root of 2019540805 is about 1264.0110702193.

Adding to 2019540805 its reverse (5080459102), we get a palindrome (7099999907).

The spelling of 2019540805 in words is "two billion, nineteen million, five hundred forty thousand, eight hundred five".