561851871 has 16 divisors (see below), whose sum is σ = 866995200. Its totient is φ = 316993248.

The previous prime is 561851863. The next prime is 561851881. The reversal of 561851871 is 178158165.

It is not a de Polignac number, because 561851871 - 2³ = 561851863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561851881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167676 + ... + 170993.

It is an arithmetic number, because the mean of its divisors is an integer number (54187200).

Almost surely, 2^561851871 is an apocalyptic number.

561851871 is a deficient number, since it is larger than the sum of its proper divisors (305143329).

561851871 is a wasteful number, since it uses less digits than its factorization.

561851871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338758.

The product of its digits is 67200, while the sum is 42.

The square root of 561851871 is about 23703.4147539969. The cubic root of 561851871 is about 825.1646422555.

The spelling of 561851871 in words is "five hundred sixty-one million, eight hundred fifty-one thousand, eight hundred seventy-one".