81304471 has 8 divisors (see below), whose sum is σ = 85039200. Its totient is φ = 77586432.

The previous prime is 81304469. The next prime is 81304481. The reversal of 81304471 is 17440318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81304471 - 2¹ = 81304469 is a prime.

It is a super-3 number, since 3×81304471³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81304411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6391 + ... + 14263.

It is an arithmetic number, because the mean of its divisors is an integer number (10629900).

Almost surely, 2^81304471 is an apocalyptic number.

81304471 is a deficient number, since it is larger than the sum of its proper divisors (3734729).

81304471 is a wasteful number, since it uses less digits than its factorization.

81304471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8345.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81304471 is about 9016.8991898546. The cubic root of 81304471 is about 433.2163206085.

Adding to 81304471 its reverse (17440318), we get a palindrome (98744789).

The spelling of 81304471 in words is "eighty-one million, three hundred four thousand, four hundred seventy-one".