4055561 has 2 divisors, whose sum is σ = 4055562. Its totient is φ = 4055560.

The previous prime is 4055551. The next prime is 4055573. The reversal of 4055561 is 1655504.

4055561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3171961 + 883600 = 1781^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 4055561 - 2⁶ = 4055497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4055561.

It is not a weakly prime, because it can be changed into another prime (4055551) 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 as a sum of consecutive naturals, namely, 2027780 + 2027781.

It is an arithmetic number, because the mean of its divisors is an integer number (2027781).

Almost surely, 2^4055561 is an apocalyptic number.

It is an amenable number.

4055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4055561 is an equidigital number, since it uses as much as digits as its factorization.

4055561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 4055561 is about 2013.8423473549. The cubic root of 4055561 is about 159.4717081137.

The spelling of 4055561 in words is "four million, fifty-five thousand, five hundred sixty-one".