5581309 has 2 divisors, whose sum is σ = 5581310. Its totient is φ = 5581308.

The previous prime is 5581259. The next prime is 5581313. The reversal of 5581309 is 9031855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5508409 + 72900 = 2347^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581309 - 2⁷ = 5581181 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5581349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2790654 + 2790655.

It is an arithmetic number, because the mean of its divisors is an integer number (2790655).

Almost surely, 2^5581309 is an apocalyptic number.

It is an amenable number.

5581309 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581309 is an equidigital number, since it uses as much as digits as its factorization.

5581309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 5581309 is about 2362.4794178998. The cubic root of 5581309 is about 177.3830109218.

The spelling of 5581309 in words is "five million, five hundred eighty-one thousand, three hundred nine".