455221 has 12 divisors (see below), whose sum is σ = 522732. Its totient is φ = 393984.

The previous prime is 455219. The next prime is 455227. The reversal of 455221 is 122554.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 324900 = 361^2 + 570^2 .

It is not a de Polignac number, because 455221 - 2¹ = 455219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

455221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455227) 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 11 ways as a sum of consecutive naturals, for example, 4645 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (43561).

2⁴⁵⁵²²¹ is an apocalyptic number.

455221 is the 361-st nonagonal number.

It is an amenable number.

455221 is a deficient number, since it is larger than the sum of its proper divisors (67511).

455221 is a wasteful number, since it uses less digits than its factorization.

455221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 129 counting only the distinct ones).

The product of its digits is 400, while the sum is 19.

The square root of 455221 is about 674.7006743735. The cubic root of 455221 is about 76.9261674912.

Adding to 455221 its reverse (122554), we get a palindrome (577775).

It can be divided in two parts, 455 and 221, that added together give a palindrome (676).

The spelling of 455221 in words is "four hundred fifty-five thousand, two hundred twenty-one".