5581909 has 4 divisors (see below), whose sum is σ = 5591916. Its totient is φ = 5571904.

The previous prime is 5581897. The next prime is 5581937. The reversal of 5581909 is 9091855.

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 4906225 + 675684 = 2215^2 + 822^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581909 - 2⁹ = 5581397 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 (5581969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4114 + ... + 5299.

It is an arithmetic number, because the mean of its divisors is an integer number (1397979).

Almost surely, 2^5581909 is an apocalyptic number.

It is an amenable number.

5581909 is a deficient number, since it is larger than the sum of its proper divisors (10007).

5581909 is an equidigital number, since it uses as much as digits as its factorization.

5581909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006.

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

The square root of 5581909 is about 2362.6063997204. The cubic root of 5581909 is about 177.3893670170.

The spelling of 5581909 in words is "five million, five hundred eighty-one thousand, nine hundred nine".