545905 has 16 divisors (see below), whose sum is σ = 705024. Its totient is φ = 404800.

The previous prime is 545899. The next prime is 545911. The reversal of 545905 is 509545.

It is an interprime number because it is at equal distance from previous prime (545899) and next prime (545911).

It is not a de Polignac number, because 545905 - 2⁵ = 545873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5355 + ... + 5455.

It is an arithmetic number, because the mean of its divisors is an integer number (44064).

2⁵⁴⁵⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

545905 is a deficient number, since it is larger than the sum of its proper divisors (159119).

545905 is a wasteful number, since it uses less digits than its factorization.

545905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 545905 is about 738.8538421095. The cubic root of 545905 is about 81.7282796651.

The spelling of 545905 in words is "five hundred forty-five thousand, nine hundred five".