91610097091 has 2 divisors, whose sum is σ = 91610097092. Its totient is φ = 91610097090.

The previous prime is 91610097049. The next prime is 91610097107. The reversal of 91610097091 is 19079001619.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19079001619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91610097091 - 2¹⁵ = 91610064323 is a prime.

It is not a weakly prime, because it can be changed into another prime (91610097001) 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, 45805048545 + 45805048546.

It is an arithmetic number, because the mean of its divisors is an integer number (45805048546).

Almost surely, 2^91610097091 is an apocalyptic number.

91610097091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91610097091 is an equidigital number, since it uses as much as digits as its factorization.

91610097091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 43.

The spelling of 91610097091 in words is "ninety-one billion, six hundred ten million, ninety-seven thousand, ninety-one".