5591809 has 12 divisors (see below), whose sum is σ = 5940220. Its totient is φ = 5261760.

The previous prime is 5591801. The next prime is 5591813. The reversal of 5591809 is 9081955.

5591809 = T₁₅₀ + T₁₅₁ + ... + T₃₃₂.

It can be written as a sum of positive squares in 6 ways, for example, as 172225 + 5419584 = 415^2 + 2328^2 .

It is not a de Polignac number, because 5591809 - 2³ = 5591801 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 (5591801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51247 + ... + 51355.

Almost surely, 2^5591809 is an apocalyptic number.

It is an amenable number.

5591809 is a deficient number, since it is larger than the sum of its proper divisors (348411).

5591809 is a wasteful number, since it uses less digits than its factorization.

5591809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 5591809 is about 2364.7006153000. The cubic root of 5591809 is about 177.4941768902.

It can be divided in two parts, 5591 and 809, that added together give a square (6400 = 80²).

The spelling of 5591809 in words is "five million, five hundred ninety-one thousand, eight hundred nine".