445561 has 4 divisors (see below), whose sum is σ = 448000. Its totient is φ = 443124.

The previous prime is 445541. The next prime is 445567. The reversal of 445561 is 165544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 445561 - 2⁷ = 445433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921 + ... + 1318.

It is an arithmetic number, because the mean of its divisors is an integer number (112000).

2⁴⁴⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

445561 is a deficient number, since it is larger than the sum of its proper divisors (2439).

445561 is a wasteful number, since it uses less digits than its factorization.

445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438.

The product of its digits is 2400, while the sum is 25.

The square root of 445561 is about 667.5035580430. The cubic root of 445561 is about 76.3781362471.

The spelling of 445561 in words is "four hundred forty-five thousand, five hundred sixty-one".