81338146 has 16 divisors (see below), whose sum is σ = 124659000. Its totient is φ = 39789568.

The previous prime is 81338129. The next prime is 81338161. The reversal of 81338146 is 64183318.

It can be written as a sum of positive squares in 4 ways, for example, as 69538921 + 11799225 = 8339^2 + 3435^2 .

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, 46740 + ... + 48448.

Almost surely, 2^81338146 is an apocalyptic number.

81338146 is a deficient number, since it is larger than the sum of its proper divisors (43320854).

81338146 is a wasteful number, since it uses less digits than its factorization.

81338146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213.

The product of its digits is 13824, while the sum is 34.

The square root of 81338146 is about 9018.7663236166. The cubic root of 81338146 is about 433.2761227561.

The spelling of 81338146 in words is "eighty-one million, three hundred thirty-eight thousand, one hundred forty-six".