442540513 has 4 divisors (see below), whose sum is σ = 450890388. Its totient is φ = 434190640.

The previous prime is 442540507. The next prime is 442540523. The reversal of 442540513 is 315045244.

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 258341329 + 184199184 = 16073^2 + 13572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442540513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442540523) 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, 4174858 + ... + 4174963.

It is an arithmetic number, because the mean of its divisors is an integer number (112722597).

Almost surely, 2^442540513 is an apocalyptic number.

It is an amenable number.

442540513 is a deficient number, since it is larger than the sum of its proper divisors (8349875).

442540513 is an equidigital number, since it uses as much as digits as its factorization.

442540513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349874.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 442540513 is about 21036.6469048658. The cubic root of 442540513 is about 762.0515398577.

Adding to 442540513 its reverse (315045244), we get a palindrome (757585757).

The spelling of 442540513 in words is "four hundred forty-two million, five hundred forty thousand, five hundred thirteen".