91871138167 has 2 divisors, whose sum is σ = 91871138168. Its totient is φ = 91871138166.

The previous prime is 91871138143. The next prime is 91871138173. The reversal of 91871138167 is 76183117819.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (76183117819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91871138167 - 2⁷ = 91871138039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91871138267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45935569083 + 45935569084.

It is an arithmetic number, because the mean of its divisors is an integer number (45935569084).

Almost surely, 2^91871138167 is an apocalyptic number.

91871138167 is a deficient number, since it is larger than the sum of its proper divisors (1).

91871138167 is an equidigital number, since it uses as much as digits as its factorization.

91871138167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 52.

The spelling of 91871138167 in words is "ninety-one billion, eight hundred seventy-one million, one hundred thirty-eight thousand, one hundred sixty-seven".