865854651 has 4 divisors (see below), whose sum is σ = 1154472872. Its totient is φ = 577236432.

The previous prime is 865854617. The next prime is 865854673. The reversal of 865854651 is 156458568.

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

It is not a de Polignac number, because 865854651 - 2⁹ = 865854139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865854651.

It is not an unprimeable number, because it can be changed into a prime (865854551) 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 3 ways as a sum of consecutive naturals, for example, 144309106 + ... + 144309111.

It is an arithmetic number, because the mean of its divisors is an integer number (288618218).

Almost surely, 2^865854651 is an apocalyptic number.

865854651 is a deficient number, since it is larger than the sum of its proper divisors (288618221).

865854651 is a wasteful number, since it uses less digits than its factorization.

865854651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288618220.

The product of its digits is 1152000, while the sum is 48.

The square root of 865854651 is about 29425.4082554516. The cubic root of 865854651 is about 953.1216429601.

The spelling of 865854651 in words is "eight hundred sixty-five million, eight hundred fifty-four thousand, six hundred fifty-one".