442545521 has 16 divisors (see below), whose sum is σ = 489198528. Its totient is φ = 400306720.

The previous prime is 442545487. The next prime is 442545533. The reversal of 442545521 is 125545244.

It is not a de Polignac number, because 442545521 - 2⁶ = 442545457 is a prime.

It is a super-2 number, since 2×442545521² = 391693076314322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442545221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309410 + ... + 310836.

It is an arithmetic number, because the mean of its divisors is an integer number (30574908).

Almost surely, 2^442545521 is an apocalyptic number.

It is an amenable number.

442545521 is a deficient number, since it is larger than the sum of its proper divisors (46653007).

442545521 is a wasteful number, since it uses less digits than its factorization.

442545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1671 counting only the distinct ones).

The product of its digits is 32000, while the sum is 32.

The square root of 442545521 is about 21036.7659349055. The cubic root of 442545521 is about 762.0544144267.

The spelling of 442545521 in words is "four hundred forty-two million, five hundred forty-five thousand, five hundred twenty-one".