91722319541 has 2 divisors, whose sum is σ = 91722319542. Its totient is φ = 91722319540.

The previous prime is 91722319523. The next prime is 91722319543. The reversal of 91722319541 is 14591322719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61142452900 + 30579866641 = 247270^2 + 174871^2 .

It is an emirp because it is prime and its reverse (14591322719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91722319541 - 2³⁰ = 90648577717 is a prime.

Together with 91722319543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91722319492 and 91722319501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91722319543) 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, 45861159770 + 45861159771.

It is an arithmetic number, because the mean of its divisors is an integer number (45861159771).

Almost surely, 2^91722319541 is an apocalyptic number.

It is an amenable number.

91722319541 is a deficient number, since it is larger than the sum of its proper divisors (1).

91722319541 is an equidigital number, since it uses as much as digits as its factorization.

91722319541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The spelling of 91722319541 in words is "ninety-one billion, seven hundred twenty-two million, three hundred nineteen thousand, five hundred forty-one".