81041438097 has 6 divisors (see below), whose sum is σ = 117059855042. Its totient is φ = 54027625392.

The previous prime is 81041438077. The next prime is 81041438117. The reversal of 81041438097 is 79083414018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81041438077) and next prime (81041438117).

It can be written as a sum of positive squares in only one way, i.e., 77084524881 + 3956913216 = 277641^2 + 62904^2 .

It is not a de Polignac number, because 81041438097 - 2⁶ = 81041438033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81041438077) 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 in 5 ways as a sum of consecutive naturals, for example, 4502302108 + ... + 4502302125.

Almost surely, 2^81041438097 is an apocalyptic number.

It is an amenable number.

81041438097 is a deficient number, since it is larger than the sum of its proper divisors (36018416945).

81041438097 is a wasteful number, since it uses less digits than its factorization.

81041438097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004604239 (or 9004604236 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 81041438097 in words is "eighty-one billion, forty-one million, four hundred thirty-eight thousand, ninety-seven".