540545 has 4 divisors (see below), whose sum is σ = 648660. Its totient is φ = 432432.

The previous prime is 540541. The next prime is 540557. The reversal of 540545 is 545045.

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 87616 + 452929 = 296^2 + 673^2 .

It is a cyclic number.

It is not a de Polignac number, because 540545 - 2² = 540541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 540545.

It is not an unprimeable number, because it can be changed into a prime (540541) 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, 54050 + ... + 54059.

It is an arithmetic number, because the mean of its divisors is an integer number (162165).

2⁵⁴⁰⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

540545 is a deficient number, since it is larger than the sum of its proper divisors (108115).

540545 is a wasteful number, since it uses less digits than its factorization.

540545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108114.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 540545 is about 735.2176548479. The cubic root of 540545 is about 81.4599147978.

The spelling of 540545 in words is "five hundred forty thousand, five hundred forty-five".