856570611121 has 9 divisors (see below), whose sum is σ = 866386453611. Its totient is φ = 846864777264.

The previous prime is 856570611107. The next prime is 856570611137. The reversal of 856570611121 is 121116075658.

The square root of 856570611121 is 925511.

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., 164479724721 + 692090886400 = 405561^2 + 831920^2 .

It is not a de Polignac number, because 856570611121 - 2⁵ = 856570611089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856570611161) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82365280 + ... + 82375678.

Almost surely, 2^856570611121 is an apocalyptic number.

856570611121 is the 925511-st square number.

856570611121 is the 462756-th centered octagonal number.

It is an amenable number.

856570611121 is a deficient number, since it is larger than the sum of its proper divisors (9815842490).

856570611121 is an frugal number, since it uses more digits than its factorization.

856570611121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20976 (or 10488 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 43.

Adding to 856570611121 its reverse (121116075658), we get a palindrome (977686686779).

The spelling of 856570611121 in words is "eight hundred fifty-six billion, five hundred seventy million, six hundred eleven thousand, one hundred twenty-one".