91099249 has 2 divisors, whose sum is σ = 91099250. Its totient is φ = 91099248.

The previous prime is 91099247. The next prime is 91099289. The reversal of 91099249 is 94299019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 11175649 = 8940^2 + 3343^2 .

It is an emirp because it is prime and its reverse (94299019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91099249 - 2¹ = 91099247 is a prime.

Together with 91099247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91099247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45549624 + 45549625.

It is an arithmetic number, because the mean of its divisors is an integer number (45549625).

Almost surely, 2^91099249 is an apocalyptic number.

It is an amenable number.

91099249 is a deficient number, since it is larger than the sum of its proper divisors (1).

91099249 is an equidigital number, since it uses as much as digits as its factorization.

91099249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 91099249 is about 9544.5926576256. The cubic root of 91099249 is about 449.9576075292.

The spelling of 91099249 in words is "ninety-one million, ninety-nine thousand, two hundred forty-nine".