91085249 has 2 divisors, whose sum is σ = 91085250. Its totient is φ = 91085248.

The previous prime is 91085243. The next prime is 91085251. The reversal of 91085249 is 94258019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80425024 + 10660225 = 8968^2 + 3265^2 .

It is an emirp because it is prime and its reverse (94258019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91085249 - 2⁴ = 91085233 is a prime.

Together with 91085251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91085243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45542624 + 45542625.

It is an arithmetic number, because the mean of its divisors is an integer number (45542625).

Almost surely, 2^91085249 is an apocalyptic number.

It is an amenable number.

91085249 is a deficient number, since it is larger than the sum of its proper divisors (1).

91085249 is an equidigital number, since it uses as much as digits as its factorization.

91085249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 91085249 is about 9543.8592298923. The cubic root of 91085249 is about 449.9345567382.

The spelling of 91085249 in words is "ninety-one million, eighty-five thousand, two hundred forty-nine".