561730209 has 8 divisors (see below), whose sum is σ = 761668320. Its totient is φ = 368139456.

The previous prime is 561730187. The next prime is 561730241. The reversal of 561730209 is 902037165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561730209 - 2⁸ = 561729953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561730209.

It is not an unprimeable number, because it can be changed into a prime (561730259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586632 + ... + 1586985.

It is an arithmetic number, because the mean of its divisors is an integer number (95208540).

Almost surely, 2^561730209 is an apocalyptic number.

561730209 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

561730209 is a deficient number, since it is larger than the sum of its proper divisors (199938111).

561730209 is a wasteful number, since it uses less digits than its factorization.

561730209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173679.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 561730209 is about 23700.8482759584. The cubic root of 561730209 is about 825.1050782596.

The spelling of 561730209 in words is "five hundred sixty-one million, seven hundred thirty thousand, two hundred nine".