81713158 has 32 divisors (see below), whose sum is σ = 132422400. Its totient is φ = 37721376.

The previous prime is 81713147. The next prime is 81713161. The reversal of 81713158 is 85131718.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 215413 + ... + 215791.

It is an arithmetic number, because the mean of its divisors is an integer number (4138200).

Almost surely, 2^81713158 is an apocalyptic number.

81713158 is a deficient number, since it is larger than the sum of its proper divisors (50709242).

81713158 is a wasteful number, since it uses less digits than its factorization.

81713158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556.

The product of its digits is 6720, while the sum is 34.

The square root of 81713158 is about 9039.5330631621. The cubic root of 81713158 is about 433.9409796074.

The spelling of 81713158 in words is "eighty-one million, seven hundred thirteen thousand, one hundred fifty-eight".