91000001017 has 2 divisors, whose sum is σ = 91000001018. Its totient is φ = 91000001016.

The previous prime is 91000000991. The next prime is 91000001039. The reversal of 91000001017 is 71010000019.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78697641961 + 12302359056 = 280531^2 + 110916^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000001017 - 2²³ = 90991612409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91000000985 and 91000001003.

It is not a weakly prime, because it can be changed into another prime (91000001087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500000508 + 45500000509.

It is an arithmetic number, because the mean of its divisors is an integer number (45500000509).

Almost surely, 2^91000001017 is an apocalyptic number.

It is an amenable number.

91000001017 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000001017 is an equidigital number, since it uses as much as digits as its factorization.

91000001017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 19.

The spelling of 91000001017 in words is "ninety-one billion, one thousand, seventeen".