86247991 has 2 divisors, whose sum is σ = 86247992. Its totient is φ = 86247990.

The previous prime is 86247947. The next prime is 86248003. The reversal of 86247991 is 19974268.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86247991 - 2²⁵ = 52693559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86647991) 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, 43123995 + 43123996.

It is an arithmetic number, because the mean of its divisors is an integer number (43123996).

Almost surely, 2^86247991 is an apocalyptic number.

86247991 is a deficient number, since it is larger than the sum of its proper divisors (1).

86247991 is an equidigital number, since it uses as much as digits as its factorization.

86247991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 86247991 is about 9286.9796489494. The cubic root of 86247991 is about 441.8243656315.

The spelling of 86247991 in words is "eighty-six million, two hundred forty-seven thousand, nine hundred ninety-one".