505555 has 4 divisors (see below), whose sum is σ = 606672. Its totient is φ = 404440.

The previous prime is 505537. The next prime is 505559. The reversal of 505555 is 555505.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 505555 - 2⁵ = 505523 is a prime.

It is a Duffinian number.

505555 is a modest number, since divided by 555 gives 505 as remainder.

505555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (505559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50551 + ... + 50560.

It is an arithmetic number, because the mean of its divisors is an integer number (151668).

2⁵⁰⁵⁵⁵⁵ is an apocalyptic number.

505555 is a deficient number, since it is larger than the sum of its proper divisors (101117).

505555 is a wasteful number, since it uses less digits than its factorization.

505555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101116.

The product of its (nonzero) digits is 3125, while the sum is 25.

The square root of 505555 is about 711.0239095839. The cubic root of 505555 is about 79.6629044945.

The spelling of 505555 in words is "five hundred five thousand, five hundred fifty-five".