91711849 has 2 divisors, whose sum is σ = 91711850. Its totient is φ = 91711848.

The previous prime is 91711843. The next prime is 91711861. The reversal of 91711849 is 94811719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89870400 + 1841449 = 9480^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 91711849 - 2¹⁷ = 91580777 is a prime.

It is a super-2 number, since 2×91711849² = 16822126493997602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91711843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45855924 + 45855925.

It is an arithmetic number, because the mean of its divisors is an integer number (45855925).

Almost surely, 2^91711849 is an apocalyptic number.

It is an amenable number.

91711849 is a deficient number, since it is larger than the sum of its proper divisors (1).

91711849 is an equidigital number, since it uses as much as digits as its factorization.

91711849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 91711849 is about 9576.6303572812. The cubic root of 91711849 is about 450.9639402637.

The spelling of 91711849 in words is "ninety-one million, seven hundred eleven thousand, eight hundred forty-nine".