561129 has 4 divisors (see below), whose sum is σ = 748176. Its totient is φ = 374084.

The previous prime is 561109. The next prime is 561161. The reversal of 561129 is 921165.

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.

It is a cyclic number.

It is not a de Polignac number, because 561129 - 2⁵ = 561097 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 561099 and 561108.

It is not an unprimeable number, because it can be changed into a prime (561109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93519 + ... + 93524.

It is an arithmetic number, because the mean of its divisors is an integer number (187044).

2⁵⁶¹¹²⁹ is an apocalyptic number.

It is an amenable number.

561129 is a deficient number, since it is larger than the sum of its proper divisors (187047).

561129 is a wasteful number, since it uses less digits than its factorization.

561129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187046.

The product of its digits is 540, while the sum is 24.

The square root of 561129 is about 749.0854423896. The cubic root of 561129 is about 82.4810608500.

The spelling of 561129 in words is "five hundred sixty-one thousand, one hundred twenty-nine".