561875 has 20 divisors (see below), whose sum is σ = 749760. Its totient is φ = 420000.

The previous prime is 561839. The next prime is 561907. The reversal of 561875 is 578165.

561875 = 63² + 64² + ... + 124².

It is not a de Polignac number, because 561875 - 2¹² = 557779 is a prime.

Its product of digits (8400) is a multiple of the sum of its prime factors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18110 + ... + 18140.

It is an arithmetic number, because the mean of its divisors is an integer number (37488).

2⁵⁶¹⁸⁷⁵ is an apocalyptic number.

561875 is a deficient number, since it is larger than the sum of its proper divisors (187885).

561875 is an equidigital number, since it uses as much as digits as its factorization.

561875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 65 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 561875 is about 749.5832175282. The cubic root of 561875 is about 82.5175964914.

Subtracting 561875 from its reverse (578165), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 561875 in words is "five hundred sixty-one thousand, eight hundred seventy-five".