856287971 has 16 divisors (see below), whose sum is σ = 1090298880. Its totient is φ = 653038080.

The previous prime is 856287961. The next prime is 856287973. The reversal of 856287971 is 179782658.

It is a cyclic number.

It is not a de Polignac number, because 856287971 - 2¹⁰ = 856286947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856287973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114686 + ... + 121923.

It is an arithmetic number, because the mean of its divisors is an integer number (68143680).

Almost surely, 2^856287971 is an apocalyptic number.

856287971 is a deficient number, since it is larger than the sum of its proper divisors (234010909).

856287971 is a wasteful number, since it uses less digits than its factorization.

856287971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236674.

The product of its digits is 1693440, while the sum is 53.

The square root of 856287971 is about 29262.3985858986. The cubic root of 856287971 is about 949.5983421152.

The spelling of 856287971 in words is "eight hundred fifty-six million, two hundred eighty-seven thousand, nine hundred seventy-one".