91319797 has 2 divisors, whose sum is σ = 91319798. Its totient is φ = 91319796.

The previous prime is 91319779. The next prime is 91319807. The reversal of 91319797 is 79791319.

Together with previous prime (91319779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55487601 + 35832196 = 7449^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 91319797 - 2¹¹ = 91317749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91319747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45659898 + 45659899.

It is an arithmetic number, because the mean of its divisors is an integer number (45659899).

Almost surely, 2^91319797 is an apocalyptic number.

It is an amenable number.

91319797 is a deficient number, since it is larger than the sum of its proper divisors (1).

91319797 is an equidigital number, since it uses as much as digits as its factorization.

91319797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107163, while the sum is 46.

The square root of 91319797 is about 9556.1392308819. The cubic root of 91319797 is about 450.3204252830.

The spelling of 91319797 in words is "ninety-one million, three hundred nineteen thousand, seven hundred ninety-seven".