91081467619081 has 4 divisors (see below), whose sum is σ = 92625221307600. Its totient is φ = 89537713930564.

The previous prime is 91081467619033. The next prime is 91081467619117. The reversal of 91081467619081 is 18091676418019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91081467619081 - 2³³ = 91072877684489 is a prime.

It is a super-2 number, since 2×91081467619081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91081467616081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771876844171 + ... + 771876844288.

It is an arithmetic number, because the mean of its divisors is an integer number (23156305326900).

Almost surely, 2^{91081467619081} is an apocalyptic number.

It is an amenable number.

91081467619081 is a deficient number, since it is larger than the sum of its proper divisors (1543753688519).

91081467619081 is a wasteful number, since it uses less digits than its factorization.

91081467619081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543753688518.

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 91081467619081 in words is "ninety-one trillion, eighty-one billion, four hundred sixty-seven million, six hundred nineteen thousand, eighty-one".