91358321 has 2 divisors, whose sum is σ = 91358322. Its totient is φ = 91358320.

The previous prime is 91358303. The next prime is 91358347. The reversal of 91358321 is 12385319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 24364096 = 8185^2 + 4936^2 .

It is an emirp because it is prime and its reverse (12385319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91358321 - 2⁶ = 91358257 is a prime.

It is not a weakly prime, because it can be changed into another prime (91358021) 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, 45679160 + 45679161.

It is an arithmetic number, because the mean of its divisors is an integer number (45679161).

Almost surely, 2^91358321 is an apocalyptic number.

It is an amenable number.

91358321 is a deficient number, since it is larger than the sum of its proper divisors (1).

91358321 is an equidigital number, since it uses as much as digits as its factorization.

91358321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 91358321 is about 9558.1546859213. The cubic root of 91358321 is about 450.3837401600.

The spelling of 91358321 in words is "ninety-one million, three hundred fifty-eight thousand, three hundred twenty-one".