571216865 has 4 divisors (see below), whose sum is σ = 685460244. Its totient is φ = 456973488.

The previous prime is 571216837. The next prime is 571216907. The reversal of 571216865 is 568612175.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119399329 + 451817536 = 10927^2 + 21256^2 .

It is a cyclic number.

It is not a de Polignac number, because 571216865 - 2¹⁸ = 570954721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57121682 + ... + 57121691.

It is an arithmetic number, because the mean of its divisors is an integer number (171365061).

Almost surely, 2^571216865 is an apocalyptic number.

It is an amenable number.

571216865 is a deficient number, since it is larger than the sum of its proper divisors (114243379).

571216865 is a wasteful number, since it uses less digits than its factorization.

571216865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114243378.

The product of its digits is 100800, while the sum is 41.

The square root of 571216865 is about 23900.1436188153. The cubic root of 571216865 is about 829.7240409344.

The spelling of 571216865 in words is "five hundred seventy-one million, two hundred sixteen thousand, eight hundred sixty-five".