561106187 has 4 divisors (see below), whose sum is σ = 561233616. Its totient is φ = 560978760.

The previous prime is 561106153. The next prime is 561106201. The reversal of 561106187 is 781601165.

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 561106187 - 2⁸ = 561105931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561106127) 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, 56864 + ... + 65997.

It is an arithmetic number, because the mean of its divisors is an integer number (140308404).

Almost surely, 2^561106187 is an apocalyptic number.

561106187 is a deficient number, since it is larger than the sum of its proper divisors (127429).

561106187 is a wasteful number, since it uses less digits than its factorization.

561106187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127428.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 561106187 is about 23687.6800679172. The cubic root of 561106187 is about 824.7994306427.

The spelling of 561106187 in words is "five hundred sixty-one million, one hundred six thousand, one hundred eighty-seven".