91711861 has 2 divisors, whose sum is σ = 91711862. Its totient is φ = 91711860.

The previous prime is 91711849. The next prime is 91711877. The reversal of 91711861 is 16811719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89889361 + 1822500 = 9481^2 + 1350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91711861 is a prime.

It is a super-2 number, since 2×91711861² = 16822130896166642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91711831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45855930 + 45855931.

It is an arithmetic number, because the mean of its divisors is an integer number (45855931).

Almost surely, 2^91711861 is an apocalyptic number.

It is an amenable number.

91711861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91711861 is an equidigital number, since it uses as much as digits as its factorization.

91711861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 34.

The square root of 91711861 is about 9576.6309838064. The cubic root of 91711861 is about 450.9639599324.

The spelling of 91711861 in words is "ninety-one million, seven hundred eleven thousand, eight hundred sixty-one".