81054395447 has 4 divisors (see below), whose sum is σ = 85320416280. Its totient is φ = 76788374616.

The previous prime is 81054395431. The next prime is 81054395449. The reversal of 81054395447 is 74459345018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81054395447 - 2⁴ = 81054395431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81054395395 and 81054395404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81054395449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133010388 + ... + 2133010425.

It is an arithmetic number, because the mean of its divisors is an integer number (21330104070).

Almost surely, 2^81054395447 is an apocalyptic number.

81054395447 is a deficient number, since it is larger than the sum of its proper divisors (4266020833).

81054395447 is a wasteful number, since it uses less digits than its factorization.

81054395447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266020832.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 81054395447 in words is "eighty-one billion, fifty-four million, three hundred ninety-five thousand, four hundred forty-seven".