81943334 has 16 divisors (see below), whose sum is σ = 134280720. Its totient is φ = 37193760.

The previous prime is 81943331. The next prime is 81943363. The reversal of 81943334 is 43334918.

It is a junction number, because it is equal to n+sod(n) for n = 81943294 and 81943303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81943331) 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 in 7 ways as a sum of consecutive naturals, for example, 15992 + ... + 20484.

It is an arithmetic number, because the mean of its divisors is an integer number (8392545).

Almost surely, 2^81943334 is an apocalyptic number.

81943334 is a deficient number, since it is larger than the sum of its proper divisors (52337386).

81943334 is a wasteful number, since it uses less digits than its factorization.

81943334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335.

The product of its digits is 31104, while the sum is 35.

The square root of 81943334 is about 9052.2557409742. The cubic root of 81943334 is about 434.3480505614.

The spelling of 81943334 in words is "eighty-one million, nine hundred forty-three thousand, three hundred thirty-four".