81343418 has 24 divisors (see below), whose sum is σ = 134395200. Its totient is φ = 36897744.

The previous prime is 81343397. The next prime is 81343441. The reversal of 81343418 is 81434318.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17903 + ... + 21981.

It is an arithmetic number, because the mean of its divisors is an integer number (5599800).

Almost surely, 2^81343418 is an apocalyptic number.

81343418 is a deficient number, since it is larger than the sum of its proper divisors (53051782).

81343418 is a wasteful number, since it uses less digits than its factorization.

81343418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166 (or 4153 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 81343418 is about 9019.0585983239. The cubic root of 81343418 is about 433.2854836054.

The spelling of 81343418 in words is "eighty-one million, three hundred forty-three thousand, four hundred eighteen".