86909161 has 2 divisors, whose sum is σ = 86909162. Its totient is φ = 86909160.

The previous prime is 86909159. The next prime is 86909177. The reversal of 86909161 is 16190968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83083225 + 3825936 = 9115^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 86909161 - 2¹ = 86909159 is a prime.

Together with 86909159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (86909191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43454580 + 43454581.

It is an arithmetic number, because the mean of its divisors is an integer number (43454581).

Almost surely, 2^86909161 is an apocalyptic number.

It is an amenable number.

86909161 is a deficient number, since it is larger than the sum of its proper divisors (1).

86909161 is an equidigital number, since it uses as much as digits as its factorization.

86909161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 86909161 is about 9322.5082998086. The cubic root of 86909161 is about 442.9504893313.

The spelling of 86909161 in words is "eighty-six million, nine hundred nine thousand, one hundred sixty-one".