561509216 has 24 divisors (see below), whose sum is σ = 1107146880. Its totient is φ = 280329088.

The previous prime is 561509213. The next prime is 561509233. The reversal of 561509216 is 612905165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561509213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8705 + ... + 34623.

It is an arithmetic number, because the mean of its divisors is an integer number (46131120).

Almost surely, 2^561509216 is an apocalyptic number.

It is an amenable number.

561509216 is a deficient number, since it is larger than the sum of its proper divisors (545637664).

561509216 is a wasteful number, since it uses less digits than its factorization.

561509216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26606 (or 26598 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 561509216 is about 23696.1856846202. The cubic root of 561509216 is about 824.9968612063.

The spelling of 561509216 in words is "five hundred sixty-one million, five hundred nine thousand, two hundred sixteen".