86663989 has 2 divisors, whose sum is σ = 86663990. Its totient is φ = 86663988.

The previous prime is 86663987. The next prime is 86664007. The reversal of 86663989 is 98936668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81757764 + 4906225 = 9042^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 86663989 - 2¹ = 86663987 is a prime.

Together with 86663987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86663987) 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, 43331994 + 43331995.

It is an arithmetic number, because the mean of its divisors is an integer number (43331995).

Almost surely, 2^86663989 is an apocalyptic number.

It is an amenable number.

86663989 is a deficient number, since it is larger than the sum of its proper divisors (1).

86663989 is an equidigital number, since it uses as much as digits as its factorization.

86663989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 55.

The square root of 86663989 is about 9309.3495476322. The cubic root of 86663989 is about 442.5335737983.

The spelling of 86663989 in words is "eighty-six million, six hundred sixty-three thousand, nine hundred eighty-nine".