561428089 has 4 divisors (see below), whose sum is σ = 565467280. Its totient is φ = 557388900.

The previous prime is 561428083. The next prime is 561428107. The reversal of 561428089 is 980824165.

It is a happy number.

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 561428089 - 2²⁷ = 427210361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561428083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019387 + ... + 2019664.

It is an arithmetic number, because the mean of its divisors is an integer number (141366820).

Almost surely, 2^561428089 is an apocalyptic number.

It is an amenable number.

561428089 is a deficient number, since it is larger than the sum of its proper divisors (4039191).

561428089 is a wasteful number, since it uses less digits than its factorization.

561428089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039190.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 561428089 is about 23694.4738071982. The cubic root of 561428089 is about 824.9571273711.

The spelling of 561428089 in words is "five hundred sixty-one million, four hundred twenty-eight thousand, eighty-nine".