545866 has 4 divisors (see below), whose sum is σ = 818802. Its totient is φ = 272932.

The previous prime is 545863. The next prime is 545873. The reversal of 545866 is 668545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668545 = 5 ⋅133709.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 48841 = 705^2 + 221^2 .

It is not an unprimeable number, because it can be changed into a prime (545863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136465 + ... + 136468.

2⁵⁴⁵⁸⁶⁶ is an apocalyptic number.

545866 is a deficient number, since it is larger than the sum of its proper divisors (272936).

545866 is a wasteful number, since it uses less digits than its factorization.

545866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272935.

The product of its digits is 28800, while the sum is 34.

The square root of 545866 is about 738.8274494089. The cubic root of 545866 is about 81.7263333687.

The spelling of 545866 in words is "five hundred forty-five thousand, eight hundred sixty-six".