91110919057 has 2 divisors, whose sum is σ = 91110919058. Its totient is φ = 91110919056.

The previous prime is 91110919043. The next prime is 91110919121. The reversal of 91110919057 is 75091901119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57794083216 + 33316835841 = 240404^2 + 182529^2 .

It is a cyclic number.

It is not a de Polignac number, because 91110919057 - 2⁷ = 91110918929 is a prime.

It is a super-2 number, since 2×91110919057² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91110119057) 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, 45555459528 + 45555459529.

It is an arithmetic number, because the mean of its divisors is an integer number (45555459529).

Almost surely, 2^91110919057 is an apocalyptic number.

It is an amenable number.

91110919057 is a deficient number, since it is larger than the sum of its proper divisors (1).

91110919057 is an equidigital number, since it uses as much as digits as its factorization.

91110919057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25515, while the sum is 43.

The spelling of 91110919057 in words is "ninety-one billion, one hundred ten million, nine hundred nineteen thousand, fifty-seven".