81138334 has 16 divisors (see below), whose sum is σ = 126656640. Its totient is φ = 38951640.

The previous prime is 81138313. The next prime is 81138347. The reversal of 81138334 is 43383118.

It is a junction number, because it is equal to n+sod(n) for n = 81138296 and 81138305.

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, 2922 + ... + 13069.

It is an arithmetic number, because the mean of its divisors is an integer number (7916040).

Almost surely, 2^81138334 is an apocalyptic number.

81138334 is a deficient number, since it is larger than the sum of its proper divisors (45518306).

81138334 is a wasteful number, since it uses less digits than its factorization.

81138334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16095.

The product of its digits is 6912, while the sum is 31.

The square root of 81138334 is about 9007.6819437633. The cubic root of 81138334 is about 432.9210423049.

The spelling of 81138334 in words is "eighty-one million, one hundred thirty-eight thousand, three hundred thirty-four".