856487317156 has 9 divisors (see below), whose sum is σ = 1498856044161. Its totient is φ = 428242733112.

The previous prime is 856487317141. The next prime is 856487317159. The reversal of 856487317156 is 651713784658.

The square root of 856487317156 is 925466.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 530464588900 + 326022728256 = 728330^2 + 570984^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856487317094 and 856487317103.

It is not an unprimeable number, because it can be changed into a prime (856487317159) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1619566 + ... + 2082298.

Almost surely, 2^856487317156 is an apocalyptic number.

856487317156 is the 925466-th square number.

It is an amenable number.

856487317156 is a deficient number, since it is larger than the sum of its proper divisors (642368727005).

856487317156 is an frugal number, since it uses more digits than its factorization.

856487317156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925470 (or 462735 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 61.

The spelling of 856487317156 in words is "eight hundred fifty-six billion, four hundred eighty-seven million, three hundred seventeen thousand, one hundred fifty-six".