91063261891 has 16 divisors (see below), whose sum is σ = 107752443840. Its totient is φ = 75298688640.

The previous prime is 91063261889. The next prime is 91063261897. The reversal of 91063261891 is 19816236019.

It is not a de Polignac number, because 91063261891 - 2¹ = 91063261889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91063261897) 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 15 ways as a sum of consecutive naturals, for example, 49825 + ... + 429661.

It is an arithmetic number, because the mean of its divisors is an integer number (6734527740).

Almost surely, 2^91063261891 is an apocalyptic number.

91063261891 is a deficient number, since it is larger than the sum of its proper divisors (16689181949).

91063261891 is a wasteful number, since it uses less digits than its factorization.

91063261891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381054.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 91063261891 in words is "ninety-one billion, sixty-three million, two hundred sixty-one thousand, eight hundred ninety-one".