91110000001 has 2 divisors, whose sum is σ = 91110000002. Its totient is φ = 91110000000.

The previous prime is 91109999921. The next prime is 91110000017. The reversal of 91110000001 is 10000001119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82125803776 + 8984196225 = 286576^2 + 94785^2 .

It is a cyclic number.

It is not a de Polignac number, because 91110000001 - 2²¹ = 91107902849 is a prime.

It is not a weakly prime, because it can be changed into another prime (91110000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45555000000 + 45555000001.

It is an arithmetic number, because the mean of its divisors is an integer number (45555000001).

Almost surely, 2^91110000001 is an apocalyptic number.

It is an amenable number.

91110000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91110000001 is an equidigital number, since it uses as much as digits as its factorization.

91110000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 13.

The spelling of 91110000001 in words is "ninety-one billion, one hundred ten million, one", and thus it is an aban number.