81837134 has 4 divisors (see below), whose sum is σ = 122755704. Its totient is φ = 40918566.

The previous prime is 81837121. The next prime is 81837139. The reversal of 81837134 is 43173818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43173818 = 2 ⋅21586909.

It is a junction number, because it is equal to n+sod(n) for n = 81837094 and 81837103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837139) by changing a digit.

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 as a sum of consecutive naturals, namely, 20459282 + ... + 20459285.

It is an arithmetic number, because the mean of its divisors is an integer number (30688926).

Almost surely, 2^81837134 is an apocalyptic number.

81837134 is a deficient number, since it is larger than the sum of its proper divisors (40918570).

81837134 is a wasteful number, since it uses less digits than its factorization.

81837134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40918569.

The product of its digits is 16128, while the sum is 35.

The square root of 81837134 is about 9046.3878979403. The cubic root of 81837134 is about 434.1603285404.

The spelling of 81837134 in words is "eighty-one million, eight hundred thirty-seven thousand, one hundred thirty-four".