86779009 has 2 divisors, whose sum is σ = 86779010. Its totient is φ = 86779008.

The previous prime is 86778997. The next prime is 86779037. The reversal of 86779009 is 90097768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58476609 + 28302400 = 7647^2 + 5320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86779009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86779009.

It is not a weakly prime, because it can be changed into another prime (86779109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43389504 + 43389505.

It is an arithmetic number, because the mean of its divisors is an integer number (43389505).

Almost surely, 2^86779009 is an apocalyptic number.

It is an amenable number.

86779009 is a deficient number, since it is larger than the sum of its proper divisors (1).

86779009 is an equidigital number, since it uses as much as digits as its factorization.

86779009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 86779009 is about 9315.5251596461. The cubic root of 86779009 is about 442.7292633446.

The spelling of 86779009 in words is "eighty-six million, seven hundred seventy-nine thousand, nine".