861424865 has 16 divisors (see below), whose sum is σ = 1232748288. Its totient is φ = 565008576.

The previous prime is 861424853. The next prime is 861424873. The reversal of 861424865 is 568424168.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 861424865 - 2¹⁰ = 861423841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534242 + ... + 535851.

It is an arithmetic number, because the mean of its divisors is an integer number (77046768).

Almost surely, 2^861424865 is an apocalyptic number.

It is an amenable number.

861424865 is a deficient number, since it is larger than the sum of its proper divisors (371323423).

861424865 is a wasteful number, since it uses less digits than its factorization.

861424865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070128.

The product of its digits is 368640, while the sum is 44.

The square root of 861424865 is about 29350.0402895805. The cubic root of 861424865 is about 951.4934460141.

The spelling of 861424865 in words is "eight hundred sixty-one million, four hundred twenty-four thousand, eight hundred sixty-five".