561661171 has 4 divisors (see below), whose sum is σ = 561722344. Its totient is φ = 561600000.

The previous prime is 561661159. The next prime is 561661207. The reversal of 561661171 is 171166165.

561661171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 561661171 - 2¹³ = 561652979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561661271) 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, 13710 + ... + 36211.

It is an arithmetic number, because the mean of its divisors is an integer number (140430586).

Almost surely, 2^561661171 is an apocalyptic number.

561661171 is a deficient number, since it is larger than the sum of its proper divisors (61173).

561661171 is a wasteful number, since it uses less digits than its factorization.

561661171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61172.

The product of its digits is 7560, while the sum is 34.

The square root of 561661171 is about 23699.3917854446. The cubic root of 561661171 is about 825.0712744054.

The spelling of 561661171 in words is "five hundred sixty-one million, six hundred sixty-one thousand, one hundred seventy-one".