81326343 has 16 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 46405056.

The previous prime is 81326341. The next prime is 81326347. The reversal of 81326343 is 34362318.

It is not a de Polignac number, because 81326343 - 2¹ = 81326341 is a prime.

It is a super-2 number, since 2×81326343² = 13227948131507298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81326343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81326341) 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, 14596 + ... + 19382.

It is an arithmetic number, because the mean of its divisors is an integer number (7756560).

Almost surely, 2^81326343 is an apocalyptic number.

81326343 is a deficient number, since it is larger than the sum of its proper divisors (42778617).

81326343 is a wasteful number, since it uses less digits than its factorization.

81326343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606.

The product of its digits is 10368, while the sum is 30.

The square root of 81326343 is about 9018.1119420863. Note that the first 3 decimals coincide. The cubic root of 81326343 is about 433.2551641379.

The spelling of 81326343 in words is "eighty-one million, three hundred twenty-six thousand, three hundred forty-three".