86751809 has 2 divisors, whose sum is σ = 86751810. Its totient is φ = 86751808.

The previous prime is 86751787. The next prime is 86751817. The reversal of 86751809 is 90815768.

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., 72726784 + 14025025 = 8528^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 86751809 - 2¹⁶ = 86686273 is a prime.

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 86751809.

It is not a weakly prime, because it can be changed into another prime (86751109) 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, 43375904 + 43375905.

It is an arithmetic number, because the mean of its divisors is an integer number (43375905).

Almost surely, 2^86751809 is an apocalyptic number.

It is an amenable number.

86751809 is a deficient number, since it is larger than the sum of its proper divisors (1).

86751809 is an equidigital number, since it uses as much as digits as its factorization.

86751809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 86751809 is about 9314.0651168005. The cubic root of 86751809 is about 442.6830021789.

The spelling of 86751809 in words is "eighty-six million, seven hundred fifty-one thousand, eight hundred nine".