91133321 has 2 divisors, whose sum is σ = 91133322. Its totient is φ = 91133320.

The previous prime is 91133303. The next prime is 91133353. The reversal of 91133321 is 12333119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90935296 + 198025 = 9536^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 91133321 - 2¹⁴ = 91116937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91138321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45566660 + 45566661.

It is an arithmetic number, because the mean of its divisors is an integer number (45566661).

Almost surely, 2^91133321 is an apocalyptic number.

It is an amenable number.

91133321 is a deficient number, since it is larger than the sum of its proper divisors (1).

91133321 is an equidigital number, since it uses as much as digits as its factorization.

91133321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 23.

The square root of 91133321 is about 9546.3773757379. The cubic root of 91133321 is about 450.0136967024.

The spelling of 91133321 in words is "ninety-one million, one hundred thirty-three thousand, three hundred twenty-one".