1004453521 has 4 divisors (see below), whose sum is σ = 1005714612. Its totient is φ = 1003192432.

The previous prime is 1004453519. The next prime is 1004453573. The reversal of 1004453521 is 1253544001.

It is a happy number.

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 211411600 + 793041921 = 14540^2 + 28161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004453521 - 2¹ = 1004453519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1004453581) 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, 629350 + ... + 630943.

It is an arithmetic number, because the mean of its divisors is an integer number (251428653).

Almost surely, 2^1004453521 is an apocalyptic number.

It is an amenable number.

1004453521 is a deficient number, since it is larger than the sum of its proper divisors (1261091).

1004453521 is an equidigital number, since it uses as much as digits as its factorization.

1004453521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261090.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1004453521 is about 31693.1147254415. The cubic root of 1004453521 is about 1001.4823086753.

Adding to 1004453521 its reverse (1253544001), we get a palindrome (2257997522).

The spelling of 1004453521 in words is "one billion, four million, four hundred fifty-three thousand, five hundred twenty-one".