91397 has 2 divisors, whose sum is σ = 91398. Its totient is φ = 91396.

The previous prime is 91393. The next prime is 91411. The reversal of 91397 is 79319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73441 + 17956 = 271^2 + 134^2 .

It is an emirp because it is prime and its reverse (79319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91397 - 2² = 91393 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91397.

It is not a weakly prime, because it can be changed into another prime (91393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45698 + 45699.

It is an arithmetic number, because the mean of its divisors is an integer number (45699).

2⁹¹³⁹⁷ is an apocalyptic number.

It is an amenable number.

91397 is a deficient number, since it is larger than the sum of its proper divisors (1).

91397 is an equidigital number, since it uses as much as digits as its factorization.

91397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701, while the sum is 29.

The square root of 91397 is about 302.3193675569. The cubic root of 91397 is about 45.0447291878.

The spelling of 91397 in words is "ninety-one thousand, three hundred ninety-seven".