9100100991 has 4 divisors (see below), whose sum is σ = 12133467992. Its totient is φ = 6066733992.

The previous prime is 9100100957. The next prime is 9100101029. The reversal of 9100100991 is 1990010019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990010019 = 3 ⋅663336673.

It is not a de Polignac number, because 9100100991 - 2⁹ = 9100100479 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 (9100100951) 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, 1516683496 + ... + 1516683501.

It is an arithmetic number, because the mean of its divisors is an integer number (3033366998).

Almost surely, 2^9100100991 is an apocalyptic number.

9100100991 is a deficient number, since it is larger than the sum of its proper divisors (3033367001).

9100100991 is a wasteful number, since it uses less digits than its factorization.

9100100991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033367000.

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

The square root of 9100100991 is about 95394.4494768957. The cubic root of 9100100991 is about 2087.7672018919.

The spelling of 9100100991 in words is "nine billion, one hundred million, one hundred thousand, nine hundred ninety-one".