581066 has 4 divisors (see below), whose sum is σ = 871602. Its totient is φ = 290532.

The previous prime is 581047. The next prime is 581069. The reversal of 581066 is 660185.

581066 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 326041 + 255025 = 571^2 + 505^2 .

It is not an unprimeable number, because it can be changed into a prime (581069) by changing a digit.

581066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 145265 + ... + 145268.

2⁵⁸¹⁰⁶⁶ is an apocalyptic number.

581066 is a deficient number, since it is larger than the sum of its proper divisors (290536).

581066 is a wasteful number, since it uses less digits than its factorization.

581066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290535.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 581066 is about 762.2768525936. The cubic root of 581066 is about 83.4465696164.

The spelling of 581066 in words is "five hundred eighty-one thousand, sixty-six".