481581 has 12 divisors (see below), whose sum is σ = 706108. Its totient is φ = 316224.

The previous prime is 481577. The next prime is 481589. The reversal of 481581 is 185184.

481581 is a `hidden beast` number, since 4 + 81 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 396900 + 84681 = 630^2 + 291^2 .

It is not a de Polignac number, because 481581 - 2² = 481577 is a prime.

It is a super-2 number, since 2×481581² = 463840519122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (481589) 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 11 ways as a sum of consecutive naturals, for example, 291 + ... + 1023.

2⁴⁸¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

481581 is a deficient number, since it is larger than the sum of its proper divisors (224527).

481581 is a wasteful number, since it uses less digits than its factorization.

481581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 809 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 481581 is about 693.9603735085. The cubic root of 481581 is about 78.3832225831.

The spelling of 481581 in words is "four hundred eighty-one thousand, five hundred eighty-one".