5581409 has 4 divisors (see below), whose sum is σ = 5630916. Its totient is φ = 5531904.

The previous prime is 5581403. The next prime is 5581447. The reversal of 5581409 is 9041855.

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 1960000 + 3621409 = 1400^2 + 1903^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581409 - 2⁴ = 5581393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5581403) 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, 24584 + ... + 24809.

It is an arithmetic number, because the mean of its divisors is an integer number (1407729).

Almost surely, 2^5581409 is an apocalyptic number.

It is an amenable number.

5581409 is a deficient number, since it is larger than the sum of its proper divisors (49507).

5581409 is a wasteful number, since it uses less digits than its factorization.

5581409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49506.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 5581409 is about 2362.5005820105. The cubic root of 5581409 is about 177.3840703027.

The spelling of 5581409 in words is "five million, five hundred eighty-one thousand, four hundred nine".