581345 has 4 divisors (see below), whose sum is σ = 697620. Its totient is φ = 465072.

The previous prime is 581341. The next prime is 581351. The reversal of 581345 is 543185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543185 = 5 ⋅108637.

It can be written as a sum of positive squares in 2 ways, for example, as 398161 + 183184 = 631^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 581345 - 2² = 581341 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581341) 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, 58130 + ... + 58139.

It is an arithmetic number, because the mean of its divisors is an integer number (174405).

2⁵⁸¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

581345 is a deficient number, since it is larger than the sum of its proper divisors (116275).

581345 is a wasteful number, since it uses less digits than its factorization.

581345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116274.

The product of its digits is 2400, while the sum is 26.

The square root of 581345 is about 762.4598350077. The cubic root of 581345 is about 83.4599231584.

The spelling of 581345 in words is "five hundred eighty-one thousand, three hundred forty-five".