9691000091 has 2 divisors, whose sum is σ = 9691000092. Its totient is φ = 9691000090.

The previous prime is 9690999979. The next prime is 9691000129. The reversal of 9691000091 is 1900001969.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9691000091 - 2³⁰ = 8617258267 is a prime.

It is not a weakly prime, because it can be changed into another prime (9691009091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4845500045 + 4845500046.

It is an arithmetic number, because the mean of its divisors is an integer number (4845500046).

Almost surely, 2^9691000091 is an apocalyptic number.

9691000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9691000091 is an equidigital number, since it uses as much as digits as its factorization.

9691000091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 9691000091 is about 98442.8772994776. The cubic root of 9691000091 is about 2132.0114490355.

The spelling of 9691000091 in words is "nine billion, six hundred ninety-one million, ninety-one", and thus it is an aban number.