81343654 has 16 divisors (see below), whose sum is σ = 141811200. Its totient is φ = 34270344.

The previous prime is 81343621. The next prime is 81343673. The reversal of 81343654 is 45634318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48414 + ... + 50065.

It is an arithmetic number, because the mean of its divisors is an integer number (8863200).

Almost surely, 2^81343654 is an apocalyptic number.

81343654 is a deficient number, since it is larger than the sum of its proper divisors (60467546).

81343654 is a wasteful number, since it uses less digits than its factorization.

81343654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98547.

The product of its digits is 34560, while the sum is 34.

The square root of 81343654 is about 9019.0716817198. The cubic root of 81343654 is about 433.2859026324.

The spelling of 81343654 in words is "eighty-one million, three hundred forty-three thousand, six hundred fifty-four".