81715883 has 8 divisors (see below), whose sum is σ = 82658400. Its totient is φ = 80777088.

The previous prime is 81715873. The next prime is 81715901. The reversal of 81715883 is 38851718.

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 81715883 - 2¹⁰ = 81714859 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 81715883.

It is not an unprimeable number, because it can be changed into a prime (81715873) 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, 80483 + ... + 81491.

It is an arithmetic number, because the mean of its divisors is an integer number (10332300).

Almost surely, 2^81715883 is an apocalyptic number.

81715883 is a deficient number, since it is larger than the sum of its proper divisors (942517).

81715883 is a wasteful number, since it uses less digits than its factorization.

81715883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861.

The product of its digits is 53760, while the sum is 41.

The square root of 81715883 is about 9039.6837887174. The cubic root of 81715883 is about 433.9458032941.

The spelling of 81715883 in words is "eighty-one million, seven hundred fifteen thousand, eight hundred eighty-three".