561545 has 16 divisors (see below), whose sum is σ = 743040. Its totient is φ = 405504.

The previous prime is 561529. The next prime is 561551. The reversal of 561545 is 545165.

It is a cyclic number.

It is not a de Polignac number, because 561545 - 2⁴ = 561529 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2057 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (46440).

2⁵⁶¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

561545 is a deficient number, since it is larger than the sum of its proper divisors (181495).

561545 is a wasteful number, since it uses less digits than its factorization.

561545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 3000, while the sum is 26.

The square root of 561545 is about 749.3630628741. The cubic root of 561545 is about 82.5014386036.

The spelling of 561545 in words is "five hundred sixty-one thousand, five hundred forty-five".