865371161 has 2 divisors, whose sum is σ = 865371162. Its totient is φ = 865371160.

The previous prime is 865371151. The next prime is 865371257. The reversal of 865371161 is 161173568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604225561 + 261145600 = 24581^2 + 16160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865371161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865371151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432685580 + 432685581.

It is an arithmetic number, because the mean of its divisors is an integer number (432685581).

Almost surely, 2^865371161 is an apocalyptic number.

It is an amenable number.

865371161 is a deficient number, since it is larger than the sum of its proper divisors (1).

865371161 is an equidigital number, since it uses as much as digits as its factorization.

865371161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 865371161 is about 29417.1915892731. The cubic root of 865371161 is about 952.9442034082.

The spelling of 865371161 in words is "eight hundred sixty-five million, three hundred seventy-one thousand, one hundred sixty-one".