9100900991 has 16 divisors (see below), whose sum is σ = 11790643200. Its totient is φ = 6821726688.

The previous prime is 9100900979. The next prime is 9100900997. The reversal of 9100900991 is 1990090019.

It is a happy number.

9100900991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9100900991 - 2¹⁸ = 9100638847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9100900997) 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, 2630111 + ... + 2633568.

It is an arithmetic number, because the mean of its divisors is an integer number (736915200).

Almost surely, 2^9100900991 is an apocalyptic number.

9100900991 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9100900991 is a deficient number, since it is larger than the sum of its proper divisors (2689742209).

9100900991 is a wasteful number, since it uses less digits than its factorization.

9100900991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263718.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 9100900991 is about 95398.6425008239. The cubic root of 9100900991 is about 2087.8283794115.

The spelling of 9100900991 in words is "nine billion, one hundred million, nine hundred thousand, nine hundred ninety-one".