81731034 has 96 divisors (see below), whose sum is σ = 223217280. Its totient is φ = 20995200.

The previous prime is 81731009. The next prime is 81731047. The reversal of 81731034 is 43013718.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81730989 and 81731007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150804 + ... + 151344.

It is an arithmetic number, because the mean of its divisors is an integer number (2325180).

Almost surely, 2^81731034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81731034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111608640).

81731034 is an abundant number, since it is smaller than the sum of its proper divisors (141486246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81731034 is a wasteful number, since it uses less digits than its factorization.

81731034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 81731034 is about 9040.5217769773. The cubic root of 81731034 is about 433.9726210368.

The spelling of 81731034 in words is "eighty-one million, seven hundred thirty-one thousand, thirty-four".