91020271 has 2 divisors, whose sum is σ = 91020272. Its totient is φ = 91020270.

The previous prime is 91020217. The next prime is 91020283. The reversal of 91020271 is 17202019.

Together with previous prime (91020217) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91020271 - 2⁷ = 91020143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91020071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45510135 + 45510136.

It is an arithmetic number, because the mean of its divisors is an integer number (45510136).

Almost surely, 2^91020271 is an apocalyptic number.

91020271 is a deficient number, since it is larger than the sum of its proper divisors (1).

91020271 is an equidigital number, since it uses as much as digits as its factorization.

91020271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 91020271 is about 9540.4544441028. The cubic root of 91020271 is about 449.8275404989.

The spelling of 91020271 in words is "ninety-one million, twenty thousand, two hundred seventy-one".