81532847 has 8 divisors (see below), whose sum is σ = 89098752. Its totient is φ = 73992600.

The previous prime is 81532837. The next prime is 81532877. The reversal of 81532847 is 74823518.

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

It is not a de Polignac number, because 81532847 - 2⁴ = 81532831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81532847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81532807) 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, 572 + ... + 12782.

It is an arithmetic number, because the mean of its divisors is an integer number (11137344).

Almost surely, 2^81532847 is an apocalyptic number.

81532847 is a deficient number, since it is larger than the sum of its proper divisors (7565905).

81532847 is a wasteful number, since it uses less digits than its factorization.

81532847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12829.

The product of its digits is 53760, while the sum is 38.

The square root of 81532847 is about 9029.5540864430. The cubic root of 81532847 is about 433.6215616306.

The spelling of 81532847 in words is "eighty-one million, five hundred thirty-two thousand, eight hundred forty-seven".