442454521 has 4 divisors (see below), whose sum is σ = 442528372. Its totient is φ = 442380672.

The previous prime is 442454489. The next prime is 442454543. The reversal of 442454521 is 125454244.

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 277588921 + 164865600 = 16661^2 + 12840^2 .

It is a cyclic number.

It is not a de Polignac number, because 442454521 - 2⁵ = 442454489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442454021) 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, 27060 + ... + 40213.

It is an arithmetic number, because the mean of its divisors is an integer number (110632093).

Almost surely, 2^442454521 is an apocalyptic number.

It is an amenable number.

442454521 is a deficient number, since it is larger than the sum of its proper divisors (73851).

442454521 is an equidigital number, since it uses as much as digits as its factorization.

442454521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73850.

The product of its digits is 25600, while the sum is 31.

The square root of 442454521 is about 21034.6029437211. The cubic root of 442454521 is about 762.0021774611.

The spelling of 442454521 in words is "four hundred forty-two million, four hundred fifty-four thousand, five hundred twenty-one".