81173326 has 16 divisors (see below), whose sum is σ = 131315184. Its totient is φ = 37410624.

The previous prime is 81173297. The next prime is 81173329. The reversal of 81173326 is 62337118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81173329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20461 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (8207199).

Almost surely, 2^81173326 is an apocalyptic number.

81173326 is a deficient number, since it is larger than the sum of its proper divisors (50141858).

81173326 is a wasteful number, since it uses less digits than its factorization.

81173326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515.

The product of its digits is 6048, while the sum is 31.

The square root of 81173326 is about 9009.6240765084. The cubic root of 81173326 is about 432.9832677052.

The spelling of 81173326 in words is "eighty-one million, one hundred seventy-three thousand, three hundred twenty-six".