581385 has 32 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 263424.

The previous prime is 581377. The next prime is 581393. The reversal of 581385 is 583185.

It is a happy number.

581385 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 (581377) and next prime (581393).

It is not a de Polignac number, because 581385 - 2³ = 581377 is a prime.

It is a Curzon number.

581385 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5089 + ... + 5201.

It is an arithmetic number, because the mean of its divisors is an integer number (34200).

2⁵⁸¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

581385 is a deficient number, since it is larger than the sum of its proper divisors (513015).

581385 is a wasteful number, since it uses less digits than its factorization.

581385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 128 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 581385 is about 762.4860654464. The cubic root of 581385 is about 83.4618372945.

The spelling of 581385 in words is "five hundred eighty-one thousand, three hundred eighty-five".