8172089 has 2 divisors, whose sum is σ = 8172090. Its totient is φ = 8172088.

The previous prime is 8172083. The next prime is 8172091. The reversal of 8172089 is 9802718.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4804864 + 3367225 = 2192^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172089 - 2¹² = 8167993 is a prime.

It is a Sophie Germain prime.

Together with 8172091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8172083) 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 as a sum of consecutive naturals, namely, 4086044 + 4086045.

It is an arithmetic number, because the mean of its divisors is an integer number (4086045).

Almost surely, 2^8172089 is an apocalyptic number.

It is an amenable number.

8172089 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172089 is an equidigital number, since it uses as much as digits as its factorization.

8172089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8172089 is about 2858.6865865289. The cubic root of 8172089 is about 201.4239132961.

The spelling of 8172089 in words is "eight million, one hundred seventy-two thousand, eighty-nine".