91000910001 has 16 divisors (see below), whose sum is σ = 127740824640. Its totient is φ = 57465146880.

The previous prime is 91000909997. The next prime is 91000910027. The reversal of 91000910001 is 10001900019.

It is not a de Polignac number, because 91000910001 - 2² = 91000909997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91000910001.

It is not an unprimeable number, because it can be changed into a prime (91000910041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245641 + ... + 492281.

It is an arithmetic number, because the mean of its divisors is an integer number (7983801540).

Almost surely, 2^91000910001 is an apocalyptic number.

It is an amenable number.

91000910001 is a deficient number, since it is larger than the sum of its proper divisors (36739914639).

91000910001 is a wasteful number, since it uses less digits than its factorization.

91000910001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253136.

The product of its (nonzero) digits is 81, while the sum is 21.

It can be divided in two parts, 91000 and 910001, that added together give a palindrome (1001001).

The spelling of 91000910001 in words is "ninety-one billion, nine hundred ten thousand, one".