81324323 has 16 divisors (see below), whose sum is σ = 86261760. Its totient is φ = 76557600.

The previous prime is 81324319. The next prime is 81324403. The reversal of 81324323 is 32342318.

It is a Cunningham number, because it is equal to 9018²-1.

It is a cyclic number.

It is not a de Polignac number, because 81324323 - 2² = 81324319 is a prime.

It is a super-2 number, since 2×81324323² = 13227291022816658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81324292 and 81324301.

It is not an unprimeable number, because it can be changed into a prime (81324623) by changing a digit.

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, 261338 + ... + 261648.

It is an arithmetic number, because the mean of its divisors is an integer number (5391360).

Almost surely, 2^81324323 is an apocalyptic number.

81324323 is a deficient number, since it is larger than the sum of its proper divisors (4937437).

81324323 is a wasteful number, since it uses less digits than its factorization.

81324323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538.

The product of its digits is 3456, while the sum is 26.

The square root of 81324323 is about 9017.9999445553. Note that the first 4 decimals coincide. The cubic root of 81324323 is about 433.2515770153.

The spelling of 81324323 in words is "eighty-one million, three hundred twenty-four thousand, three hundred twenty-three".