91000910901 has 4 divisors (see below), whose sum is σ = 121334547872. Its totient is φ = 60667273932.

The previous prime is 91000910873. The next prime is 91000910909. The reversal of 91000910901 is 10901900019.

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 not a de Polignac number, because 91000910901 - 2⁹ = 91000910389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000910909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15166818481 + ... + 15166818486.

It is an arithmetic number, because the mean of its divisors is an integer number (30333636968).

Almost surely, 2^91000910901 is an apocalyptic number.

It is an amenable number.

91000910901 is a deficient number, since it is larger than the sum of its proper divisors (30333636971).

91000910901 is a wasteful number, since it uses less digits than its factorization.

91000910901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30333636970.

The product of its (nonzero) digits is 729, while the sum is 30.

The spelling of 91000910901 in words is "ninety-one billion, nine hundred ten thousand, nine hundred one".