581409 has 6 divisors (see below), whose sum is σ = 839826. Its totient is φ = 387600.

The previous prime is 581407. The next prime is 581411. The reversal of 581409 is 904185.

581409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (581407) and next prime (581411).

It can be written as a sum of positive squares in only one way, i.e., 567009 + 14400 = 753^2 + 120^2 .

It is not a de Polignac number, because 581409 - 2¹ = 581407 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 581409.

It is not an unprimeable number, because it can be changed into a prime (581407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32292 + ... + 32309.

It is an arithmetic number, because the mean of its divisors is an integer number (139971).

2⁵⁸¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

581409 is a deficient number, since it is larger than the sum of its proper divisors (258417).

581409 is a wasteful number, since it uses less digits than its factorization.

581409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64607 (or 64604 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 581409 is about 762.5018032766. The cubic root of 581409 is about 83.4629857340.

It can be divided in two parts, 581 and 409, that added together give a triangular number (990 = T₄₄).

The spelling of 581409 in words is "five hundred eighty-one thousand, four hundred nine".