4457521 has 4 divisors (see below), whose sum is σ = 4601344. Its totient is φ = 4313700.

The previous prime is 4457507. The next prime is 4457539. The reversal of 4457521 is 1257544.

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 4457521 - 2⁵ = 4457489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4457521.

It is not an unprimeable number, because it can be changed into a prime (4457221) 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, 71865 + ... + 71926.

It is an arithmetic number, because the mean of its divisors is an integer number (1150336).

Almost surely, 2^4457521 is an apocalyptic number.

It is an amenable number.

4457521 is a deficient number, since it is larger than the sum of its proper divisors (143823).

4457521 is a wasteful number, since it uses less digits than its factorization.

4457521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143822.

The product of its digits is 5600, while the sum is 28.

The square root of 4457521 is about 2111.2842063540. The cubic root of 4457521 is about 164.5752282003.

The spelling of 4457521 in words is "four million, four hundred fifty-seven thousand, five hundred twenty-one".