561724187 has 4 divisors (see below), whose sum is σ = 567515256. Its totient is φ = 555933120.

The previous prime is 561724133. The next prime is 561724211. The reversal of 561724187 is 781427165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561724187 - 2¹² = 561720091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561723187) 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, 2895389 + ... + 2895582.

It is an arithmetic number, because the mean of its divisors is an integer number (141878814).

Almost surely, 2^561724187 is an apocalyptic number.

561724187 is a deficient number, since it is larger than the sum of its proper divisors (5791069).

561724187 is an equidigital number, since it uses as much as digits as its factorization.

561724187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791068.

The product of its digits is 94080, while the sum is 41.

The square root of 561724187 is about 23700.7212337515. The cubic root of 561724187 is about 825.1021297501.

The spelling of 561724187 in words is "five hundred sixty-one million, seven hundred twenty-four thousand, one hundred eighty-seven".