91144193444069 has 2 divisors, whose sum is σ = 91144193444070. Its totient is φ = 91144193444068.

The previous prime is 91144193444023. The next prime is 91144193444123. The reversal of 91144193444069 is 96044439144119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84620000381569 + 6524193062500 = 9198913^2 + 2554250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91144193444069 is a prime.

It is a super-2 number, since 2×91144193444069² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91144193443999 and 91144193444017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91144123444069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45572096722034 + 45572096722035.

It is an arithmetic number, because the mean of its divisors is an integer number (45572096722035).

Almost surely, 2^{91144193444069} is an apocalyptic number.

It is an amenable number.

91144193444069 is a deficient number, since it is larger than the sum of its proper divisors (1).

91144193444069 is an equidigital number, since it uses as much as digits as its factorization.

91144193444069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 59.

The spelling of 91144193444069 in words is "ninety-one trillion, one hundred forty-four billion, one hundred ninety-three million, four hundred forty-four thousand, sixty-nine".