86420209 has 2 divisors, whose sum is σ = 86420210. Its totient is φ = 86420208.

The previous prime is 86420207. The next prime is 86420287. The reversal of 86420209 is 90202468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 15186609 = 8440^2 + 3897^2 .

It is a cyclic number.

It is not a de Polignac number, because 86420209 - 2¹ = 86420207 is a prime.

Together with 86420207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86420207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43210104 + 43210105.

It is an arithmetic number, because the mean of its divisors is an integer number (43210105).

Almost surely, 2^86420209 is an apocalyptic number.

It is an amenable number.

86420209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86420209 is an equidigital number, since it uses as much as digits as its factorization.

86420209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 86420209 is about 9296.2470384559. The cubic root of 86420209 is about 442.1182450168.

The spelling of 86420209 in words is "eighty-six million, four hundred twenty thousand, two hundred nine".