445532321 has 4 divisors (see below), whose sum is σ = 479804052. Its totient is φ = 411260592.

The previous prime is 445532303. The next prime is 445532323. The reversal of 445532321 is 123235544.

It is a happy number.

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 304991296 + 140541025 = 17464^2 + 11855^2 .

It is a cyclic number.

It is not a de Polignac number, because 445532321 - 2²² = 441338017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (445532323) 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, 17135846 + ... + 17135871.

It is an arithmetic number, because the mean of its divisors is an integer number (119951013).

Almost surely, 2^445532321 is an apocalyptic number.

It is an amenable number.

445532321 is a deficient number, since it is larger than the sum of its proper divisors (34271731).

445532321 is a wasteful number, since it uses less digits than its factorization.

445532321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34271730.

The product of its digits is 14400, while the sum is 29.

The square root of 445532321 is about 21107.6365564693. The cubic root of 445532321 is about 763.7649749243.

Adding to 445532321 its reverse (123235544), we get a palindrome (568767865).

The spelling of 445532321 in words is "four hundred forty-five million, five hundred thirty-two thousand, three hundred twenty-one".