81344545 has 8 divisors (see below), whose sum is σ = 99690624. Its totient is φ = 63690864.

The previous prime is 81344521. The next prime is 81344551. The reversal of 81344545 is 54544318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81344545 - 2²¹ = 79247393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81344545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172839 + ... + 173308.

It is an arithmetic number, because the mean of its divisors is an integer number (12461328).

Almost surely, 2^81344545 is an apocalyptic number.

It is an amenable number.

81344545 is a deficient number, since it is larger than the sum of its proper divisors (18346079).

81344545 is a wasteful number, since it uses less digits than its factorization.

81344545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346199.

The product of its digits is 38400, while the sum is 34.

The square root of 81344545 is about 9019.1210769121. The cubic root of 81344545 is about 433.2874846298.

The spelling of 81344545 in words is "eighty-one million, three hundred forty-four thousand, five hundred forty-five".