1004553521 has 4 divisors (see below), whose sum is σ = 1007059044. Its totient is φ = 1002048000.

The previous prime is 1004553509. The next prime is 1004553553. The reversal of 1004553521 is 1253554001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 843263521 + 161290000 = 29039^2 + 12700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004553521 - 2¹⁸ = 1004291377 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 (1004553421) 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, 1252160 + ... + 1252961.

It is an arithmetic number, because the mean of its divisors is an integer number (251764761).

Almost surely, 2^1004553521 is an apocalyptic number.

It is an amenable number.

1004553521 is a deficient number, since it is larger than the sum of its proper divisors (2505523).

1004553521 is an equidigital number, since it uses as much as digits as its factorization.

1004553521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505522.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1004553521 is about 31694.6923159068. The cubic root of 1004553521 is about 1001.5155423045.

The spelling of 1004553521 in words is "one billion, four million, five hundred fifty-three thousand, five hundred twenty-one".