81284441471 has 4 divisors (see below), whose sum is σ = 82818110232. Its totient is φ = 79750772712.

The previous prime is 81284441453. The next prime is 81284441477. The reversal of 81284441471 is 17414448218.

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 81284441471 - 2¹⁴ = 81284425087 is a prime.

It is a super-3 number, since 3×81284441471³ (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 (81284441477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766834301 + ... + 766834406.

It is an arithmetic number, because the mean of its divisors is an integer number (20704527558).

Almost surely, 2^81284441471 is an apocalyptic number.

81284441471 is a deficient number, since it is larger than the sum of its proper divisors (1533668761).

81284441471 is a wasteful number, since it uses less digits than its factorization.

81284441471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533668760.

The product of its digits is 229376, while the sum is 44.

Adding to 81284441471 its reverse (17414448218), we get a palindrome (98698889689).

The spelling of 81284441471 in words is "eighty-one billion, two hundred eighty-four million, four hundred forty-one thousand, four hundred seventy-one".