91506212129 has 2 divisors, whose sum is σ = 91506212130. Its totient is φ = 91506212128.

The previous prime is 91506212051. The next prime is 91506212159. The reversal of 91506212129 is 92121260519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91494150400 + 12061729 = 302480^2 + 3473^2 .

It is a cyclic number.

It is not a de Polignac number, because 91506212129 - 2²⁴ = 91489434913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91506212092 and 91506212101.

It is not a weakly prime, because it can be changed into another prime (91506212159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45753106064 + 45753106065.

It is an arithmetic number, because the mean of its divisors is an integer number (45753106065).

Almost surely, 2^91506212129 is an apocalyptic number.

It is an amenable number.

91506212129 is a deficient number, since it is larger than the sum of its proper divisors (1).

91506212129 is an equidigital number, since it uses as much as digits as its factorization.

91506212129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 91506212129 in words is "ninety-one billion, five hundred six million, two hundred twelve thousand, one hundred twenty-nine".