91001818193 has 48 divisors (see below), whose sum is σ = 118771837056. Its totient is φ = 68747627520.

The previous prime is 91001818183. The next prime is 91001818273. The reversal of 91001818193 is 39181810019.

It is not a de Polignac number, because 91001818193 - 2¹⁶ = 91001752657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91001818193.

It is not an unprimeable number, because it can be changed into a prime (91001818183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 664271 + ... + 789467.

It is an arithmetic number, because the mean of its divisors is an integer number (2474413272).

Almost surely, 2^91001818193 is an apocalyptic number.

It is an amenable number.

91001818193 is a deficient number, since it is larger than the sum of its proper divisors (27770018863).

91001818193 is a wasteful number, since it uses less digits than its factorization.

91001818193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125274 (or 125261 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 41.

The spelling of 91001818193 in words is "ninety-one billion, one million, eight hundred eighteen thousand, one hundred ninety-three".