442502521 has 4 divisors (see below), whose sum is σ = 443488500. Its totient is φ = 441516544.

The previous prime is 442502507. The next prime is 442502539. The reversal of 442502521 is 125205244.

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 249292521 + 193210000 = 15789^2 + 13900^2 .

It is a cyclic number.

It is not a de Polignac number, because 442502521 - 2⁹ = 442502009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442502591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492316 + ... + 493213.

It is an arithmetic number, because the mean of its divisors is an integer number (110872125).

Almost surely, 2^442502521 is an apocalyptic number.

It is an amenable number.

442502521 is a deficient number, since it is larger than the sum of its proper divisors (985979).

442502521 is an equidigital number, since it uses as much as digits as its factorization.

442502521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985978.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 442502521 is about 21035.7438898652. The cubic root of 442502521 is about 762.0297319179.

Adding to 442502521 its reverse (125205244), we get a palindrome (567707765).

The spelling of 442502521 in words is "four hundred forty-two million, five hundred two thousand, five hundred twenty-one".