86508491 has 2 divisors, whose sum is σ = 86508492. Its totient is φ = 86508490.

The previous prime is 86508469. The next prime is 86508509. The reversal of 86508491 is 19480568.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86508491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86508091) 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, 43254245 + 43254246.

It is an arithmetic number, because the mean of its divisors is an integer number (43254246).

Almost surely, 2^86508491 is an apocalyptic number.

86508491 is a deficient number, since it is larger than the sum of its proper divisors (1).

86508491 is an equidigital number, since it uses as much as digits as its factorization.

86508491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 86508491 is about 9300.9940866555. The cubic root of 86508491 is about 442.2687414506.

The spelling of 86508491 in words is "eighty-six million, five hundred eight thousand, four hundred ninety-one".