86865209 has 2 divisors, whose sum is σ = 86865210. Its totient is φ = 86865208.

The previous prime is 86865187. The next prime is 86865221. The reversal of 86865209 is 90256868.

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., 86862400 + 2809 = 9320^2 + 53^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86865209 is a prime.

It is a super-2 number, since 2×86865209² = 15091129069227362, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86865209.

It is not a weakly prime, because it can be changed into another prime (86865239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43432604 + 43432605.

It is an arithmetic number, because the mean of its divisors is an integer number (43432605).

Almost surely, 2^86865209 is an apocalyptic number.

It is an amenable number.

86865209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86865209 is an equidigital number, since it uses as much as digits as its factorization.

86865209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 86865209 is about 9320.1506962066. The cubic root of 86865209 is about 442.8758065917.

The spelling of 86865209 in words is "eighty-six million, eight hundred sixty-five thousand, two hundred nine".