86907209 has 2 divisors, whose sum is σ = 86907210. Its totient is φ = 86907208.

The previous prime is 86907203. The next prime is 86907211. The reversal of 86907209 is 90270968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 31360000 = 7453^2 + 5600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86907209 is a prime.

Together with 86907211, 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 (86907203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43453604 + 43453605.

It is an arithmetic number, because the mean of its divisors is an integer number (43453605).

Almost surely, 2^86907209 is an apocalyptic number.

It is an amenable number.

86907209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86907209 is an equidigital number, since it uses as much as digits as its factorization.

86907209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 86907209 is about 9322.4036063668. The cubic root of 86907209 is about 442.9471730494.

The spelling of 86907209 in words is "eighty-six million, nine hundred seven thousand, two hundred nine".