91997912167 has 6 divisors (see below), whose sum is σ = 105141388184. Its totient is φ = 78854665440.

The previous prime is 91997912131. The next prime is 91997912203. The reversal of 91997912167 is 76121979919.

It is an interprime number because it is at equal distance from previous prime (91997912131) and next prime (91997912203).

It is not a de Polignac number, because 91997912167 - 2¹¹ = 91997910119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91995912167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 745167 + ... + 859807.

Almost surely, 2^91997912167 is an apocalyptic number.

91997912167 is a deficient number, since it is larger than the sum of its proper divisors (13143476017).

91997912167 is an frugal number, since it uses more digits than its factorization.

91997912167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229289 (or 114648 counting only the distinct ones).

The product of its digits is 3857868, while the sum is 61.

The spelling of 91997912167 in words is "ninety-one billion, nine hundred ninety-seven million, nine hundred twelve thousand, one hundred sixty-seven".