91099369 has 2 divisors, whose sum is σ = 91099370. Its totient is φ = 91099368.

The previous prime is 91099361. The next prime is 91099381. The reversal of 91099369 is 96399019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72046144 + 19053225 = 8488^2 + 4365^2 .

It is an emirp because it is prime and its reverse (96399019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91099369 - 2³ = 91099361 is a prime.

It is a super-2 number, since 2×91099369² = 16598190064396322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91099361) 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, 45549684 + 45549685.

It is an arithmetic number, because the mean of its divisors is an integer number (45549685).

Almost surely, 2^91099369 is an apocalyptic number.

It is an amenable number.

91099369 is a deficient number, since it is larger than the sum of its proper divisors (1).

91099369 is an equidigital number, since it uses as much as digits as its factorization.

91099369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 91099369 is about 9544.5989439054. The cubic root of 91099369 is about 449.9578050972.

The spelling of 91099369 in words is "ninety-one million, ninety-nine thousand, three hundred sixty-nine".