8165881 has 2 divisors, whose sum is σ = 8165882. Its totient is φ = 8165880.

The previous prime is 8165879. The next prime is 8165903. The reversal of 8165881 is 1885618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5221225 + 2944656 = 2285^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 8165881 - 2¹ = 8165879 is a prime.

It is a super-2 number, since 2×8165881² = 133363225012322, which contains 22 as substring.

Together with 8165879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8165881.

It is not a weakly prime, because it can be changed into another prime (8165581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4082940 + 4082941.

It is an arithmetic number, because the mean of its divisors is an integer number (4082941).

Almost surely, 2^8165881 is an apocalyptic number.

It is an amenable number.

8165881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8165881 is an equidigital number, since it uses as much as digits as its factorization.

8165881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 37.

The square root of 8165881 is about 2857.6005669092. The cubic root of 8165881 is about 201.3728958870.

The spelling of 8165881 in words is "eight million, one hundred sixty-five thousand, eight hundred eighty-one".