91584487 has 2 divisors, whose sum is σ = 91584488. Its totient is φ = 91584486.

The previous prime is 91584481. The next prime is 91584497. The reversal of 91584487 is 78448519.

It is a weak prime.

It is an emirp because it is prime and its reverse (78448519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91584487 - 2¹⁹ = 91060199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91584481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45792243 + 45792244.

It is an arithmetic number, because the mean of its divisors is an integer number (45792244).

Almost surely, 2^91584487 is an apocalyptic number.

91584487 is a deficient number, since it is larger than the sum of its proper divisors (1).

91584487 is an equidigital number, since it uses as much as digits as its factorization.

91584487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 91584487 is about 9569.9784221282. The cubic root of 91584487 is about 450.7550894705.

The spelling of 91584487 in words is "ninety-one million, five hundred eighty-four thousand, four hundred eighty-seven".