4505921 has 4 divisors (see below), whose sum is σ = 5149632. Its totient is φ = 3862212.

The previous prime is 4505899. The next prime is 4505929. The reversal of 4505921 is 1295054.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1295054 = 2 ⋅647527.

It is a cyclic number.

It is not a de Polignac number, because 4505921 - 2¹⁰ = 4504897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4505929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321845 + ... + 321858.

It is an arithmetic number, because the mean of its divisors is an integer number (1287408).

Almost surely, 2^4505921 is an apocalyptic number.

It is an amenable number.

4505921 is a deficient number, since it is larger than the sum of its proper divisors (643711).

4505921 is an equidigital number, since it uses as much as digits as its factorization.

4505921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643710.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 4505921 is about 2122.7154778726. The cubic root of 4505921 is about 165.1687407511.

The spelling of 4505921 in words is "four million, five hundred five thousand, nine hundred twenty-one".