81517318 has 16 divisors (see below), whose sum is σ = 127110960. Its totient is φ = 39160800.

The previous prime is 81517309. The next prime is 81517343. The reversal of 81517318 is 81371518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8908 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (7944435).

Almost surely, 2^81517318 is an apocalyptic number.

81517318 is a deficient number, since it is larger than the sum of its proper divisors (45593642).

81517318 is a wasteful number, since it uses less digits than its factorization.

81517318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6903.

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

The square root of 81517318 is about 9028.6941469960. The cubic root of 81517318 is about 433.5940302449.

The spelling of 81517318 in words is "eighty-one million, five hundred seventeen thousand, three hundred eighteen".