561169 has 4 divisors (see below), whose sum is σ = 641344. Its totient is φ = 480996.

The previous prime is 561161. The next prime is 561173. The reversal of 561169 is 961165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 961165 = 5 ⋅192233.

It is a cyclic number.

It is not a de Polignac number, because 561169 - 2³ = 561161 is a prime.

It is a super-2 number, since 2×561169² = 629821293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40077 + ... + 40090.

It is an arithmetic number, because the mean of its divisors is an integer number (160336).

2⁵⁶¹¹⁶⁹ is an apocalyptic number.

561169 is the 433-rd hex number.

It is an amenable number.

561169 is a deficient number, since it is larger than the sum of its proper divisors (80175).

561169 is an equidigital number, since it uses as much as digits as its factorization.

561169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80174.

The product of its digits is 1620, while the sum is 28.

The square root of 561169 is about 749.1121411378. The cubic root of 561169 is about 82.4830206869.

It can be divided in two parts, 56 and 1169, that added together give a triangular number (1225 = T₄₉).

The spelling of 561169 in words is "five hundred sixty-one thousand, one hundred sixty-nine".