91235156891 has 2 divisors, whose sum is σ = 91235156892. Its totient is φ = 91235156890.

The previous prime is 91235156879. The next prime is 91235156921. The reversal of 91235156891 is 19865153219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91235156891 - 2¹⁰ = 91235155867 is a prime.

It is not a weakly prime, because it can be changed into another prime (91235156801) 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, 45617578445 + 45617578446.

It is an arithmetic number, because the mean of its divisors is an integer number (45617578446).

Almost surely, 2^91235156891 is an apocalyptic number.

91235156891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91235156891 is an equidigital number, since it uses as much as digits as its factorization.

91235156891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 50.

The spelling of 91235156891 in words is "ninety-one billion, two hundred thirty-five million, one hundred fifty-six thousand, eight hundred ninety-one".