91355562829481 has 2 divisors, whose sum is σ = 91355562829482. Its totient is φ = 91355562829480.

The previous prime is 91355562829423. The next prime is 91355562829499. The reversal of 91355562829481 is 18492826555319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91319219219881 + 36343609600 = 9556109^2 + 190640^2 .

It is an emirp because it is prime and its reverse (18492826555319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91355562829481 - 2¹⁰ = 91355562828457 is a prime.

It is a super-2 number, since 2×91355562829481² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91355562829681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45677781414740 + 45677781414741.

It is an arithmetic number, because the mean of its divisors is an integer number (45677781414741).

Almost surely, 2^{91355562829481} is an apocalyptic number.

It is an amenable number.

91355562829481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91355562829481 is an equidigital number, since it uses as much as digits as its factorization.

91355562829481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624000, while the sum is 68.

The spelling of 91355562829481 in words is "ninety-one trillion, three hundred fifty-five billion, five hundred sixty-two million, eight hundred twenty-nine thousand, four hundred eighty-one".