86651009 has 2 divisors, whose sum is σ = 86651010. Its totient is φ = 86651008.

The previous prime is 86650997. The next prime is 86651011. The reversal of 86651009 is 90015668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83320384 + 3330625 = 9128^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 86651009 - 2¹² = 86646913 is a prime.

Together with 86651011, it forms a pair of twin primes.

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 86651009.

It is not a weakly prime, because it can be changed into another prime (86651809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43325504 + 43325505.

It is an arithmetic number, because the mean of its divisors is an integer number (43325505).

Almost surely, 2^86651009 is an apocalyptic number.

It is an amenable number.

86651009 is a deficient number, since it is larger than the sum of its proper divisors (1).

86651009 is an equidigital number, since it uses as much as digits as its factorization.

86651009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 86651009 is about 9308.6523729270. The cubic root of 86651009 is about 442.5114793749.

The spelling of 86651009 in words is "eighty-six million, six hundred fifty-one thousand, nine".