91268138069 has 2 divisors, whose sum is σ = 91268138070. Its totient is φ = 91268138068.

The previous prime is 91268138063. The next prime is 91268138081. The reversal of 91268138069 is 96083186219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58111369969 + 33156768100 = 241063^2 + 182090^2 .

It is a cyclic number.

It is not a de Polignac number, because 91268138069 - 2⁴ = 91268138053 is a prime.

It is a super-2 number, since 2×91268138069² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91268138069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91268138063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45634069034 + 45634069035.

It is an arithmetic number, because the mean of its divisors is an integer number (45634069035).

Almost surely, 2^91268138069 is an apocalyptic number.

It is an amenable number.

91268138069 is a deficient number, since it is larger than the sum of its proper divisors (1).

91268138069 is an equidigital number, since it uses as much as digits as its factorization.

91268138069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 91268138069 in words is "ninety-one billion, two hundred sixty-eight million, one hundred thirty-eight thousand, sixty-nine".