445540561 has 4 divisors (see below), whose sum is σ = 445605300. Its totient is φ = 445475824.

The previous prime is 445540559. The next prime is 445540591. The reversal of 445540561 is 165045544.

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 78588225 + 366952336 = 8865^2 + 19156^2 .

It is a cyclic number.

It is not a de Polignac number, because 445540561 - 2¹ = 445540559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445540541) 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, 20626 + ... + 36283.

It is an arithmetic number, because the mean of its divisors is an integer number (111401325).

Almost surely, 2^445540561 is an apocalyptic number.

It is an amenable number.

445540561 is a deficient number, since it is larger than the sum of its proper divisors (64739).

445540561 is an equidigital number, since it uses as much as digits as its factorization.

445540561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64738.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 445540561 is about 21107.8317455868. The cubic root of 445540561 is about 763.7696834376.

The spelling of 445540561 in words is "four hundred forty-five million, five hundred forty thousand, five hundred sixty-one".