86909993 has 2 divisors, whose sum is σ = 86909994. Its totient is φ = 86909992.

The previous prime is 86909989. The next prime is 86910007. The reversal of 86909993 is 39990968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45333289 + 41576704 = 6733^2 + 6448^2 .

It is a cyclic number.

It is not a de Polignac number, because 86909993 - 2² = 86909989 is a prime.

It is not a weakly prime, because it can be changed into another prime (86909903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43454996 + 43454997.

It is an arithmetic number, because the mean of its divisors is an integer number (43454997).

Almost surely, 2^86909993 is an apocalyptic number.

It is an amenable number.

86909993 is a deficient number, since it is larger than the sum of its proper divisors (1).

86909993 is an equidigital number, since it uses as much as digits as its factorization.

86909993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 86909993 is about 9322.5529228854. The cubic root of 86909993 is about 442.9519028134.

The spelling of 86909993 in words is "eighty-six million, nine hundred nine thousand, nine hundred ninety-three".