545555 has 4 divisors (see below), whose sum is σ = 654672. Its totient is φ = 436440.

The previous prime is 545551. The next prime is 545579. The reversal of 545555 is 555545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555545 = 5 ⋅111109.

It is not a de Polignac number, because 545555 - 2² = 545551 is a prime.

It is a Duffinian number.

545555 is a modest number, since divided by 555 gives 545 as remainder.

It is not an unprimeable number, because it can be changed into a prime (545551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54551 + ... + 54560.

It is an arithmetic number, because the mean of its divisors is an integer number (163668).

2⁵⁴⁵⁵⁵⁵ is an apocalyptic number.

545555 is a deficient number, since it is larger than the sum of its proper divisors (109117).

545555 is a wasteful number, since it uses less digits than its factorization.

545555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109116.

The product of its digits is 12500, while the sum is 29.

The square root of 545555 is about 738.6169507938. The cubic root of 545555 is about 81.7108095844.

The spelling of 545555 in words is "five hundred forty-five thousand, five hundred fifty-five".