91122112117 has 2 divisors, whose sum is σ = 91122112118. Its totient is φ = 91122112116.

The previous prime is 91122112087. The next prime is 91122112127. The reversal of 91122112117 is 71121122119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79925509521 + 11196602596 = 282711^2 + 105814^2 .

It is a cyclic number.

It is not a de Polignac number, because 91122112117 - 2³¹ = 88974628469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91122112127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45561056058 + 45561056059.

It is an arithmetic number, because the mean of its divisors is an integer number (45561056059).

Almost surely, 2^91122112117 is an apocalyptic number.

It is an amenable number.

91122112117 is a deficient number, since it is larger than the sum of its proper divisors (1).

91122112117 is an equidigital number, since it uses as much as digits as its factorization.

91122112117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 28.

The spelling of 91122112117 in words is "ninety-one billion, one hundred twenty-two million, one hundred twelve thousand, one hundred seventeen".