561187 has 8 divisors (see below), whose sum is σ = 648432. Its totient is φ = 480000.

The previous prime is 561181. The next prime is 561191. The reversal of 561187 is 781165.

It is a happy number.

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 561187 - 2⁷ = 561059 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561181) 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, 1314 + ... + 1687.

It is an arithmetic number, because the mean of its divisors is an integer number (81054).

2⁵⁶¹¹⁸⁷ is an apocalyptic number.

561187 is a deficient number, since it is larger than the sum of its proper divisors (87245).

561187 is a wasteful number, since it uses less digits than its factorization.

561187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029.

The product of its digits is 1680, while the sum is 28.

The square root of 561187 is about 749.1241552640. The cubic root of 561187 is about 82.4839025832.

The spelling of 561187 in words is "five hundred sixty-one thousand, one hundred eighty-seven".