431221 has 4 divisors (see below), whose sum is σ = 492832. Its totient is φ = 369612.

The previous prime is 431219. The next prime is 431237. The reversal of 431221 is 122134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431221 - 2¹ = 431219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431251) 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, 30795 + ... + 30808.

It is an arithmetic number, because the mean of its divisors is an integer number (123208).

2⁴³¹²²¹ is an apocalyptic number.

It is an amenable number.

431221 is a deficient number, since it is larger than the sum of its proper divisors (61611).

431221 is an equidigital number, since it uses as much as digits as its factorization.

431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61610.

The product of its digits is 48, while the sum is 13.

The square root of 431221 is about 656.6741962343. The cubic root of 431221 is about 75.5497968346.

Adding to 431221 its reverse (122134), we get a palindrome (553355).

The spelling of 431221 in words is "four hundred thirty-one thousand, two hundred twenty-one".