581421 has 16 divisors (see below), whose sum is σ = 826560. Its totient is φ = 362880.

The previous prime is 581411. The next prime is 581429. The reversal of 581421 is 124185.

It is not a de Polignac number, because 581421 - 2⁷ = 581293 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 581421.

It is not an unprimeable number, because it can be changed into a prime (581429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3486 + ... + 3648.

It is an arithmetic number, because the mean of its divisors is an integer number (51660).

2⁵⁸¹⁴²¹ is an apocalyptic number.

It is an amenable number.

581421 is a deficient number, since it is larger than the sum of its proper divisors (245139).

581421 is a wasteful number, since it uses less digits than its factorization.

581421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its digits is 320, while the sum is 21.

The square root of 581421 is about 762.5096720698. The cubic root of 581421 is about 83.4635599419.

The spelling of 581421 in words is "five hundred eighty-one thousand, four hundred twenty-one".