91121222117 has 2 divisors, whose sum is σ = 91121222118. Its totient is φ = 91121222116.

The previous prime is 91121222107. The next prime is 91121222131. The reversal of 91121222117 is 71122212119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91098934276 + 22287841 = 301826^2 + 4721^2 .

It is a cyclic number.

It is not a de Polignac number, because 91121222117 - 2⁶ = 91121222053 is a prime.

It is a super-3 number, since 3×91121222117³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91121222117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91121222107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560611058 + 45560611059.

It is an arithmetic number, because the mean of its divisors is an integer number (45560611059).

Almost surely, 2^91121222117 is an apocalyptic number.

It is an amenable number.

91121222117 is a deficient number, since it is larger than the sum of its proper divisors (1).

91121222117 is an equidigital number, since it uses as much as digits as its factorization.

91121222117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The spelling of 91121222117 in words is "ninety-one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred seventeen".