4205561 has 4 divisors (see below), whose sum is σ = 4230912. Its totient is φ = 4180212.

The previous prime is 4205549. The next prime is 4205569. The reversal of 4205561 is 1655024.

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 4205561 - 2¹⁰ = 4204537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4205569) 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, 12425 + ... + 12758.

It is an arithmetic number, because the mean of its divisors is an integer number (1057728).

Almost surely, 2^4205561 is an apocalyptic number.

It is an amenable number.

4205561 is a deficient number, since it is larger than the sum of its proper divisors (25351).

4205561 is a wasteful number, since it uses less digits than its factorization.

4205561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25350.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 4205561 is about 2050.7464494666. The cubic root of 4205561 is about 161.4140417430.

The spelling of 4205561 in words is "four million, two hundred five thousand, five hundred sixty-one".