91366321 has 2 divisors, whose sum is σ = 91366322. Its totient is φ = 91366320.

The previous prime is 91366291. The next prime is 91366333. The reversal of 91366321 is 12366319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 3381921 = 9380^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 91366321 - 2⁹ = 91365809 is a prime.

It is a super-2 number, since 2×91366321² = 16695609226150082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91366351) 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, 45683160 + 45683161.

It is an arithmetic number, because the mean of its divisors is an integer number (45683161).

Almost surely, 2^91366321 is an apocalyptic number.

It is an amenable number.

91366321 is a deficient number, since it is larger than the sum of its proper divisors (1).

91366321 is an equidigital number, since it uses as much as digits as its factorization.

91366321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 91366321 is about 9558.5731675810. The cubic root of 91366321 is about 450.3968860699.

The spelling of 91366321 in words is "ninety-one million, three hundred sixty-six thousand, three hundred twenty-one".