86781109 has 2 divisors, whose sum is σ = 86781110. Its totient is φ = 86781108.

The previous prime is 86781091. The next prime is 86781127. The reversal of 86781109 is 90118768.

Together with previous prime (86781091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (86781091) and next prime (86781127).

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 25472209 = 7830^2 + 5047^2 .

It is a cyclic number.

It is not a de Polignac number, because 86781109 - 2⁵ = 86781077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86784109) 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, 43390554 + 43390555.

It is an arithmetic number, because the mean of its divisors is an integer number (43390555).

Almost surely, 2^86781109 is an apocalyptic number.

It is an amenable number.

86781109 is a deficient number, since it is larger than the sum of its proper divisors (1).

86781109 is an equidigital number, since it uses as much as digits as its factorization.

86781109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 86781109 is about 9315.6378740267. The cubic root of 86781109 is about 442.7328345767.

The spelling of 86781109 in words is "eighty-six million, seven hundred eighty-one thousand, one hundred nine".