455621 has 4 divisors (see below), whose sum is σ = 456972. Its totient is φ = 454272.

The previous prime is 455603. The next prime is 455627. The reversal of 455621 is 126554.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126554 = 2 ⋅63277.

It can be written as a sum of positive squares in 2 ways, for example, as 343396 + 112225 = 586^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 455621 - 2⁶ = 455557 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 (455627) 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, 335 + ... + 1011.

It is an arithmetic number, because the mean of its divisors is an integer number (114243).

455621 is a Friedman number, since it can be written as 15^6/5^2-4, using all its digits and the basic arithmetic operations.

2⁴⁵⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

455621 is a deficient number, since it is larger than the sum of its proper divisors (1351).

455621 is an equidigital number, since it uses as much as digits as its factorization.

455621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350.

The product of its digits is 1200, while the sum is 23.

The square root of 455621 is about 674.9970370305. The cubic root of 455621 is about 76.9486924178.

The spelling of 455621 in words is "four hundred fifty-five thousand, six hundred twenty-one".