561448187 has 4 divisors (see below), whose sum is σ = 561495720. Its totient is φ = 561400656.

The previous prime is 561448169. The next prime is 561448211. The reversal of 561448187 is 781844165.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 781844165 = 5 ⋅156368833.

It is a cyclic number.

It is not a de Polignac number, because 561448187 - 2¹⁴ = 561431803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561448117) 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, 9128 + ... + 34730.

It is an arithmetic number, because the mean of its divisors is an integer number (140373930).

Almost surely, 2^561448187 is an apocalyptic number.

561448187 is a deficient number, since it is larger than the sum of its proper divisors (47533).

561448187 is a wasteful number, since it uses less digits than its factorization.

561448187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47532.

The product of its digits is 215040, while the sum is 44.

The square root of 561448187 is about 23694.8979107318. The cubic root of 561448187 is about 824.9669711907.

The spelling of 561448187 in words is "five hundred sixty-one million, four hundred forty-eight thousand, one hundred eighty-seven".