81320038471 has 8 divisors (see below), whose sum is σ = 92947274784. Its totient is φ = 69695324160.

The previous prime is 81320038409. The next prime is 81320038477. The reversal of 81320038471 is 17483002318.

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

It is not a de Polignac number, because 81320038471 - 2⁹ = 81320037959 is a prime.

It is a super-3 number, since 3×81320038471³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 81320038471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81320038477) 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, 560890 + ... + 690823.

It is an arithmetic number, because the mean of its divisors is an integer number (11618409348).

Almost surely, 2^81320038471 is an apocalyptic number.

81320038471 is a deficient number, since it is larger than the sum of its proper divisors (11627236313).

81320038471 is a wasteful number, since it uses less digits than its factorization.

81320038471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261001.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 81320038471 in words is "eighty-one billion, three hundred twenty million, thirty-eight thousand, four hundred seventy-one".