4405561 has 4 divisors (see below), whose sum is σ = 4410000. Its totient is φ = 4401124.

The previous prime is 4405559. The next prime is 4405571. The reversal of 4405561 is 1655044.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4405561 - 2¹ = 4405559 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4405501) 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, 30 + ... + 2968.

It is an arithmetic number, because the mean of its divisors is an integer number (1102500).

Almost surely, 2^4405561 is an apocalyptic number.

It is an amenable number.

4405561 is a deficient number, since it is larger than the sum of its proper divisors (4439).

4405561 is a wasteful number, since it uses less digits than its factorization.

4405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4438.

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

The square root of 4405561 is about 2098.9428291404. The cubic root of 4405561 is about 163.9332590814.

The spelling of 4405561 in words is "four million, four hundred five thousand, five hundred sixty-one".