4545221 has 4 divisors (see below), whose sum is σ = 4565472. Its totient is φ = 4524972.

The previous prime is 4545209. The next prime is 4545223. The reversal of 4545221 is 1225454.

It is a happy number.

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: 1225454 = 2 ⋅612727.

It is a cyclic number.

It is not a de Polignac number, because 4545221 - 2⁶ = 4545157 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 (4545223) 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 3 ways as a sum of consecutive naturals, for example, 9785 + ... + 10238.

It is an arithmetic number, because the mean of its divisors is an integer number (1141368).

Almost surely, 2^4545221 is an apocalyptic number.

It is an amenable number.

4545221 is a deficient number, since it is larger than the sum of its proper divisors (20251).

4545221 is a wasteful number, since it uses less digits than its factorization.

4545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20250.

The product of its digits is 1600, while the sum is 23.

The square root of 4545221 is about 2131.9523915885. The cubic root of 4545221 is about 165.6475441485.

The spelling of 4545221 in words is "four million, five hundred forty-five thousand, two hundred twenty-one".