545861 has 4 divisors (see below), whose sum is σ = 560652. Its totient is φ = 531072.

The previous prime is 545843. The next prime is 545863. The reversal of 545861 is 168545.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 390625 + 155236 = 625^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 545861 - 2¹⁰ = 544837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 545861.

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 in 3 ways as a sum of consecutive naturals, for example, 7340 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (140163).

2⁵⁴⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

545861 is a deficient number, since it is larger than the sum of its proper divisors (14791).

545861 is a wasteful number, since it uses less digits than its factorization.

545861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14790.

The product of its digits is 4800, while the sum is 29.

The square root of 545861 is about 738.8240656611. The cubic root of 545861 is about 81.7260838368.

The spelling of 545861 in words is "five hundred forty-five thousand, eight hundred sixty-one".