81817323 has 32 divisors (see below), whose sum is σ = 132495360. Its totient is φ = 43908480.

The previous prime is 81817313. The next prime is 81817327. The reversal of 81817323 is 32371818.

It is not a de Polignac number, because 81817323 - 2⁵ = 81817291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81817327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20718 + ... + 24348.

It is an arithmetic number, because the mean of its divisors is an integer number (4140480).

Almost surely, 2^81817323 is an apocalyptic number.

81817323 is a deficient number, since it is larger than the sum of its proper divisors (50678037).

81817323 is a wasteful number, since it uses less digits than its factorization.

81817323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707.

The product of its digits is 8064, while the sum is 33.

The square root of 81817323 is about 9045.2928642471. The cubic root of 81817323 is about 434.1252921048.

The spelling of 81817323 in words is "eighty-one million, eight hundred seventeen thousand, three hundred twenty-three".