81089471 has 4 divisors (see below), whose sum is σ = 82116000. Its totient is φ = 80062944.

The previous prime is 81089461. The next prime is 81089501. The reversal of 81089471 is 17498018.

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 81089471 - 2²⁶ = 13980607 is a prime.

It is a super-3 number, since 3×81089471³ (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 (81089441) 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 3 ways as a sum of consecutive naturals, for example, 513146 + ... + 513303.

It is an arithmetic number, because the mean of its divisors is an integer number (20529000).

Almost surely, 2^81089471 is an apocalyptic number.

81089471 is a deficient number, since it is larger than the sum of its proper divisors (1026529).

81089471 is a wasteful number, since it uses less digits than its factorization.

81089471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026528.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81089471 is about 9004.9692392590. The cubic root of 81089471 is about 432.8341205107.

The spelling of 81089471 in words is "eighty-one million, eighty-nine thousand, four hundred seventy-one".