81380000471 has 64 divisors (see below), whose sum is σ = 105463710720. Its totient is φ = 60970890240.

The previous prime is 81380000417. The next prime is 81380000503. The reversal of 81380000471 is 17400008318.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81380000471 is a prime.

It is a super-3 number, since 3×81380000471³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81380006471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51538160 + ... + 51539738.

It is an arithmetic number, because the mean of its divisors is an integer number (1647870480).

Almost surely, 2^81380000471 is an apocalyptic number.

81380000471 is a deficient number, since it is larger than the sum of its proper divisors (24083710249).

81380000471 is a wasteful number, since it uses less digits than its factorization.

81380000471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 5376, while the sum is 32.

Adding to 81380000471 its reverse (17400008318), we get a palindrome (98780008789).

The spelling of 81380000471 in words is "eighty-one billion, three hundred eighty million, four hundred seventy-one", and thus it is an aban number.