81713635 has 4 divisors (see below), whose sum is σ = 98056368. Its totient is φ = 65370904.

The previous prime is 81713627. The next prime is 81713647. The reversal of 81713635 is 53631718.

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 81713635 - 2³ = 81713627 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 81713635.

It is an unprimeable number.

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, 8171359 + ... + 8171368.

It is an arithmetic number, because the mean of its divisors is an integer number (24514092).

Almost surely, 2^81713635 is an apocalyptic number.

81713635 is a deficient number, since it is larger than the sum of its proper divisors (16342733).

81713635 is a wasteful number, since it uses less digits than its factorization.

81713635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16342732.

The product of its digits is 15120, while the sum is 34.

The square root of 81713635 is about 9039.5594472297. The cubic root of 81713635 is about 433.9418239816.

The spelling of 81713635 in words is "eighty-one million, seven hundred thirteen thousand, six hundred thirty-five".