91558849 has 2 divisors, whose sum is σ = 91558850. Its totient is φ = 91558848.

The previous prime is 91558847. The next prime is 91558933. The reversal of 91558849 is 94885519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91068849 + 490000 = 9543^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 91558849 - 2¹ = 91558847 is a prime.

Together with 91558847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91558847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45779424 + 45779425.

It is an arithmetic number, because the mean of its divisors is an integer number (45779425).

Almost surely, 2^91558849 is an apocalyptic number.

It is an amenable number.

91558849 is a deficient number, since it is larger than the sum of its proper divisors (1).

91558849 is an equidigital number, since it uses as much as digits as its factorization.

91558849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The square root of 91558849 is about 9568.6388269179. The cubic root of 91558849 is about 450.7130243497.

The spelling of 91558849 in words is "ninety-one million, five hundred fifty-eight thousand, eight hundred forty-nine".