81710494 has 8 divisors (see below), whose sum is σ = 122681160. Its totient is φ = 40816776.

The previous prime is 81710441. The next prime is 81710501. The reversal of 81710494 is 49401718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 16504 + ... + 20875.

It is an arithmetic number, because the mean of its divisors is an integer number (15335145).

Almost surely, 2^81710494 is an apocalyptic number.

81710494 is a deficient number, since it is larger than the sum of its proper divisors (40970666).

81710494 is a wasteful number, since it uses less digits than its factorization.

81710494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38474.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81710494 is about 9039.3857092172. The cubic root of 81710494 is about 433.9362637968.

It can be divided in two parts, 817 and 10494, that added together give a palindrome (11311).

The spelling of 81710494 in words is "eighty-one million, seven hundred ten thousand, four hundred ninety-four".