91169777971 has 2 divisors, whose sum is σ = 91169777972. Its totient is φ = 91169777970.

The previous prime is 91169777953. The next prime is 91169777981. The reversal of 91169777971 is 17977796119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91169777971 - 2⁵ = 91169777939 is a prime.

It is not a weakly prime, because it can be changed into another prime (91169777911) 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, 45584888985 + 45584888986.

It is an arithmetic number, because the mean of its divisors is an integer number (45584888986).

Almost surely, 2^91169777971 is an apocalyptic number.

91169777971 is a deficient number, since it is larger than the sum of its proper divisors (1).

91169777971 is an equidigital number, since it uses as much as digits as its factorization.

91169777971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10501974, while the sum is 64.

The spelling of 91169777971 in words is "ninety-one billion, one hundred sixty-nine million, seven hundred seventy-seven thousand, nine hundred seventy-one".