86550431508209 has 2 divisors, whose sum is σ = 86550431508210. Its totient is φ = 86550431508208.

The previous prime is 86550431508077. The next prime is 86550431508223. The reversal of 86550431508209 is 90280513405568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84343284499600 + 2207147008609 = 9183860^2 + 1485647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86550431508209 is a prime.

It is a super-3 number, since 3×86550431508209³ (a number of 43 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (86550431502209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43275215754104 + 43275215754105.

It is an arithmetic number, because the mean of its divisors is an integer number (43275215754105).

Almost surely, 2^{86550431508209} is an apocalyptic number.

It is an amenable number.

86550431508209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86550431508209 is an equidigital number, since it uses as much as digits as its factorization.

86550431508209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368000, while the sum is 56.

The spelling of 86550431508209 in words is "eighty-six trillion, five hundred fifty billion, four hundred thirty-one million, five hundred eight thousand, two hundred nine".