91771241 has 2 divisors, whose sum is σ = 91771242. Its totient is φ = 91771240.

The previous prime is 91771217. The next prime is 91771247. The reversal of 91771241 is 14217719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56190016 + 35581225 = 7496^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 91771241 - 2⁶ = 91771177 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91771198 and 91771207.

It is not a weakly prime, because it can be changed into another prime (91771247) 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, 45885620 + 45885621.

It is an arithmetic number, because the mean of its divisors is an integer number (45885621).

Almost surely, 2^91771241 is an apocalyptic number.

It is an amenable number.

91771241 is a deficient number, since it is larger than the sum of its proper divisors (1).

91771241 is an equidigital number, since it uses as much as digits as its factorization.

91771241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 32.

The square root of 91771241 is about 9579.7307373433. The cubic root of 91771241 is about 451.0612663674.

The spelling of 91771241 in words is "ninety-one million, seven hundred seventy-one thousand, two hundred forty-one".