442644561 has 16 divisors (see below), whose sum is σ = 663673920. Its totient is φ = 291539520.

The previous prime is 442644557. The next prime is 442644563. The reversal of 442644561 is 165446244.

442644561 is a `hidden beast` number, since 4 + 4 + 2 + 644 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 442644561 - 2² = 442644557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (442644563) 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, 96520 + ... + 101001.

It is an arithmetic number, because the mean of its divisors is an integer number (41479620).

Almost surely, 2^442644561 is an apocalyptic number.

It is an amenable number.

442644561 is a deficient number, since it is larger than the sum of its proper divisors (221029359).

442644561 is a wasteful number, since it uses less digits than its factorization.

442644561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197613 (or 197607 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 442644561 is about 21039.1197772150. The cubic root of 442644561 is about 762.1112584771. Note that the first 3 decimals are identical.

The spelling of 442644561 in words is "four hundred forty-two million, six hundred forty-four thousand, five hundred sixty-one".