545761 has 4 divisors (see below), whose sum is σ = 547524. Its totient is φ = 544000.

The previous prime is 545759. The next prime is 545773. The reversal of 545761 is 167545.

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 360000 + 185761 = 600^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 545761 - 2¹ = 545759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545711) 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, 280 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (136881).

2⁵⁴⁵⁷⁶¹ is an apocalyptic number.

It is an amenable number.

545761 is a deficient number, since it is larger than the sum of its proper divisors (1763).

545761 is a wasteful number, since it uses less digits than its factorization.

545761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762.

The product of its digits is 4200, while the sum is 28.

The square root of 545761 is about 738.7563874512. The cubic root of 545761 is about 81.7210928791.

The spelling of 545761 in words is "five hundred forty-five thousand, seven hundred sixty-one".