81715361 has 8 divisors (see below), whose sum is σ = 100572864. Its totient is φ = 64653840.

The previous prime is 81715331. The next prime is 81715367. The reversal of 81715361 is 16351718.

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 81715361 - 2¹⁰ = 81714337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81715367) 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, 448895 + ... + 449076.

It is an arithmetic number, because the mean of its divisors is an integer number (12571608).

Almost surely, 2^81715361 is an apocalyptic number.

It is an amenable number.

81715361 is a deficient number, since it is larger than the sum of its proper divisors (18857503).

81715361 is a wasteful number, since it uses less digits than its factorization.

81715361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897991.

The product of its digits is 5040, while the sum is 32.

The square root of 81715361 is about 9039.6549159799. The cubic root of 81715361 is about 433.9448792788.

The spelling of 81715361 in words is "eighty-one million, seven hundred fifteen thousand, three hundred sixty-one".