581401 has 4 divisors (see below), whose sum is σ = 583204. Its totient is φ = 579600.

The previous prime is 581393. The next prime is 581407. The reversal of 581401 is 104185.

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

It can be written as a sum of positive squares in 2 ways, for example, as 90000 + 491401 = 300^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 581401 - 2³ = 581393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581407) 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, 270 + ... + 1111.

It is an arithmetic number, because the mean of its divisors is an integer number (145801).

2⁵⁸¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

581401 is a deficient number, since it is larger than the sum of its proper divisors (1803).

581401 is a wasteful number, since it uses less digits than its factorization.

581401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 581401 is about 762.4965573693. The cubic root of 581401 is about 83.4626029243.

Adding to 581401 its reverse (104185), we get a palindrome (685586).

It can be divided in two parts, 5 and 81401, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 581401 in words is "five hundred eighty-one thousand, four hundred one".