545518 has 4 divisors (see below), whose sum is σ = 818280. Its totient is φ = 272758.

The previous prime is 545497. The next prime is 545521. The reversal of 545518 is 815545.

545518 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, and also an emirpimes, since its reverse is a distinct semiprime: 815545 = 5 ⋅163109.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136378 + ... + 136381.

It is an arithmetic number, because the mean of its divisors is an integer number (204570).

2⁵⁴⁵⁵¹⁸ is an apocalyptic number.

545518 is a deficient number, since it is larger than the sum of its proper divisors (272762).

545518 is a wasteful number, since it uses less digits than its factorization.

545518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272761.

The product of its digits is 4000, while the sum is 28.

The square root of 545518 is about 738.5919035570. The cubic root of 545518 is about 81.7089623106.

Subtracting from 545518 its sum of digits (28), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 545518 in words is "five hundred forty-five thousand, five hundred eighteen".