5555561 has 4 divisors (see below), whose sum is σ = 6060624. Its totient is φ = 5050500.

The previous prime is 5555527. The next prime is 5555567. The reversal of 5555561 is 1655555.

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 5555561 - 2⁶ = 5555497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555567) 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, 252515 + ... + 252536.

It is an arithmetic number, because the mean of its divisors is an integer number (1515156).

Almost surely, 2^5555561 is an apocalyptic number.

It is an amenable number.

5555561 is a deficient number, since it is larger than the sum of its proper divisors (505063).

5555561 is a wasteful number, since it uses less digits than its factorization.

5555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505062.

The product of its digits is 18750, while the sum is 32.

The square root of 5555561 is about 2357.0237588960. The cubic root of 5555561 is about 177.1098193863.

It can be divided in two parts, 5555 and 561, that added together give a palindrome (6116).

The spelling of 5555561 in words is "five million, five hundred fifty-five thousand, five hundred sixty-one".