561561115 has 8 divisors (see below), whose sum is σ = 685295280. Its totient is φ = 441634272.

The previous prime is 561561113. The next prime is 561561139. The reversal of 561561115 is 511165165.

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

It is a cyclic number.

It is not a de Polignac number, because 561561115 - 2¹ = 561561113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561561113) 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, 951504 + ... + 952093.

It is an arithmetic number, because the mean of its divisors is an integer number (85661910).

Almost surely, 2^561561115 is an apocalyptic number.

561561115 is a deficient number, since it is larger than the sum of its proper divisors (123734165).

561561115 is a wasteful number, since it uses less digits than its factorization.

561561115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903661.

The product of its digits is 4500, while the sum is 31.

The square root of 561561115 is about 23697.2807511748. The cubic root of 561561115 is about 825.0222779414.

The spelling of 561561115 in words is "five hundred sixty-one million, five hundred sixty-one thousand, one hundred fifteen".