8712161 has 4 divisors (see below), whose sum is σ = 8735892. Its totient is φ = 8688432.

The previous prime is 8712157. The next prime is 8712163. The reversal of 8712161 is 1612178.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5973136 + 2739025 = 2444^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 8712161 - 2² = 8712157 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 8712161.

It is not an unprimeable number, because it can be changed into a prime (8712163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11306 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (2183973).

Almost surely, 2^8712161 is an apocalyptic number.

It is an amenable number.

8712161 is a deficient number, since it is larger than the sum of its proper divisors (23731).

8712161 is a wasteful number, since it uses less digits than its factorization.

8712161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23730.

The product of its digits is 672, while the sum is 26.

The square root of 8712161 is about 2951.6370034271. The cubic root of 8712161 is about 205.7667970875.

The spelling of 8712161 in words is "eight million, seven hundred twelve thousand, one hundred sixty-one".