4493391809 has 4 divisors (see below), whose sum is σ = 4493571204. Its totient is φ = 4493212416.

The previous prime is 4493391779. The next prime is 4493391811. The reversal of 4493391809 is 9081933944.

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 1457712400 + 3035679409 = 38180^2 + 55097^2 .

It is a cyclic number.

It is not a de Polignac number, because 4493391809 - 2¹² = 4493387713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4493391869) 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, 44552 + ... + 104745.

It is an arithmetic number, because the mean of its divisors is an integer number (1123392801).

Almost surely, 2^4493391809 is an apocalyptic number.

It is an amenable number.

4493391809 is a deficient number, since it is larger than the sum of its proper divisors (179395).

4493391809 is a wasteful number, since it uses less digits than its factorization.

4493391809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179394.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 4493391809 is about 67032.7666816759. The cubic root of 4493391809 is about 1650.1550890647.

The spelling of 4493391809 in words is "four billion, four hundred ninety-three million, three hundred ninety-one thousand, eight hundred nine".