81040471 has 8 divisors (see below), whose sum is σ = 86101920. Its totient is φ = 76130208.

The previous prime is 81040469. The next prime is 81040483. The reversal of 81040471 is 17404018.

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 81040471 - 2¹ = 81040469 is a prime.

It is a super-3 number, since 3×81040471³ (a number of 25 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 (81040441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36691 + ... + 38836.

It is an arithmetic number, because the mean of its divisors is an integer number (10762740).

Almost surely, 2^81040471 is an apocalyptic number.

81040471 is a deficient number, since it is larger than the sum of its proper divisors (5061449).

81040471 is a wasteful number, since it uses less digits than its factorization.

81040471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75593.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 81040471 is about 9002.2481081117. The cubic root of 81040471 is about 432.7469199364.

Adding to 81040471 its reverse (17404018), we get a palindrome (98444489).

The spelling of 81040471 in words is "eighty-one million, forty thousand, four hundred seventy-one".