5019809 has 4 divisors (see below), whose sum is σ = 5038740. Its totient is φ = 5000880.

The previous prime is 5019803. The next prime is 5019821. The reversal of 5019809 is 9089105.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9089105 = 5 ⋅1817821.

It can be written as a sum of positive squares in 2 ways, for example, as 384400 + 4635409 = 620^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 5019809 - 2⁴ = 5019793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5019803) 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, 9062 + ... + 9599.

It is an arithmetic number, because the mean of its divisors is an integer number (1259685).

Almost surely, 2^5019809 is an apocalyptic number.

It is an amenable number.

5019809 is a deficient number, since it is larger than the sum of its proper divisors (18931).

5019809 is a wasteful number, since it uses less digits than its factorization.

5019809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18930.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 5019809 is about 2240.4930260994. The cubic root of 5019809 is about 171.2231165287.

The spelling of 5019809 in words is "five million, nineteen thousand, eight hundred nine".