545511 has 4 divisors (see below), whose sum is σ = 727352. Its totient is φ = 363672.

The previous prime is 545497. The next prime is 545521. The reversal of 545511 is 115545.

545511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 545511 - 2¹⁰ = 544487 is a prime.

It is a super-2 number, since 2×545511² = 595164502242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545521) 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, 90916 + ... + 90921.

It is an arithmetic number, because the mean of its divisors is an integer number (181838).

2⁵⁴⁵⁵¹¹ is an apocalyptic number.

545511 is a deficient number, since it is larger than the sum of its proper divisors (181841).

545511 is a wasteful number, since it uses less digits than its factorization.

545511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181840.

The product of its digits is 500, while the sum is 21.

The square root of 545511 is about 738.5871647951. The cubic root of 545511 is about 81.7086128170.

Subtracting from 545511 its sum of digits (21), we obtain a triangular number (545490 = T₁₀₄₄).

It can be divided in two parts, 54 and 5511, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 545511 in words is "five hundred forty-five thousand, five hundred eleven".