871644437161 has 9 divisors (see below), whose sum is σ = 874336866039. Its totient is φ = 868960282536.

The previous prime is 871644437149. The next prime is 871644437227. The reversal of 871644437161 is 161734446178.

The square root of 871644437161 is 933619.

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

871644437161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 473791305625 + 397853131536 = 688325^2 + 630756^2 .

It is not a de Polignac number, because 871644437161 - 2²⁵ = 871610882729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 871644437099 and 871644437108.

It is not an unprimeable number, because it can be changed into a prime (871644437101) 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, 348238636 + ... + 348241138.

It is an arithmetic number, because the mean of its divisors is an integer number (97148540671).

Almost surely, 2^871644437161 is an apocalyptic number.

871644437161 is the 933619-th square number.

871644437161 is the 466810-th centered octagonal number.

It is an amenable number.

871644437161 is a deficient number, since it is larger than the sum of its proper divisors (2692428878).

871644437161 is an frugal number, since it uses more digits than its factorization.

871644437161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752 (or 2876 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 52.

The spelling of 871644437161 in words is "eight hundred seventy-one billion, six hundred forty-four million, four hundred thirty-seven thousand, one hundred sixty-one".