91864141081 has 2 divisors, whose sum is σ = 91864141082. Its totient is φ = 91864141080.

The previous prime is 91864141069. The next prime is 91864141151. The reversal of 91864141081 is 18014146819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87060403600 + 4803737481 = 295060^2 + 69309^2 .

It is an emirp because it is prime and its reverse (18014146819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91864141081 - 2¹¹ = 91864139033 is a prime.

It is a super-2 number, since 2×91864141081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91864141021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932070540 + 45932070541.

It is an arithmetic number, because the mean of its divisors is an integer number (45932070541).

Almost surely, 2^91864141081 is an apocalyptic number.

It is an amenable number.

91864141081 is a deficient number, since it is larger than the sum of its proper divisors (1).

91864141081 is an equidigital number, since it uses as much as digits as its factorization.

91864141081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 43.

The spelling of 91864141081 in words is "ninety-one billion, eight hundred sixty-four million, one hundred forty-one thousand, eighty-one".