581671 has 4 divisors (see below), whose sum is σ = 583200. Its totient is φ = 580144.

The previous prime is 581663. The next prime is 581683. The reversal of 581671 is 176185.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 581671 - 2³ = 581663 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2⁵⁸¹⁶⁷¹ is an apocalyptic number.

581671 is a deficient number, since it is larger than the sum of its proper divisors (1529).

581671 is an equidigital number, since it uses as much as digits as its factorization.

581671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its digits is 1680, while the sum is 28.

The square root of 581671 is about 762.6735867984. The cubic root of 581671 is about 83.4755208102.

The spelling of 581671 in words is "five hundred eighty-one thousand, six hundred seventy-one".