86247509 has 2 divisors, whose sum is σ = 86247510. Its totient is φ = 86247508.

The previous prime is 86247503. The next prime is 86247521. The reversal of 86247509 is 90574268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50367409 + 35880100 = 7097^2 + 5990^2 .

It is a cyclic number.

It is not a de Polignac number, because 86247509 - 2²⁰ = 85198933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86247503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43123754 + 43123755.

It is an arithmetic number, because the mean of its divisors is an integer number (43123755).

Almost surely, 2^86247509 is an apocalyptic number.

It is an amenable number.

86247509 is a deficient number, since it is larger than the sum of its proper divisors (1).

86247509 is an equidigital number, since it uses as much as digits as its factorization.

86247509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 86247509 is about 9286.9536986032. The cubic root of 86247509 is about 441.8235425796.

The spelling of 86247509 in words is "eighty-six million, two hundred forty-seven thousand, five hundred nine".