91309093 has 2 divisors, whose sum is σ = 91309094. Its totient is φ = 91309092.

The previous prime is 91309073. The next prime is 91309111. The reversal of 91309093 is 39090319.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91259809 + 49284 = 9553^2 + 222^2 .

It is an emirp because it is prime and its reverse (39090319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91309093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91309013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45654546 + 45654547.

It is an arithmetic number, because the mean of its divisors is an integer number (45654547).

Almost surely, 2^91309093 is an apocalyptic number.

It is an amenable number.

91309093 is a deficient number, since it is larger than the sum of its proper divisors (1).

91309093 is an equidigital number, since it uses as much as digits as its factorization.

91309093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 91309093 is about 9555.5791556556. The cubic root of 91309093 is about 450.3028299081.

The spelling of 91309093 in words is "ninety-one million, three hundred nine thousand, ninety-three".