81529116 has 12 divisors (see below), whose sum is σ = 190234632. Its totient is φ = 27176368.

The previous prime is 81529103. The next prime is 81529141. The reversal of 81529116 is 61192518.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3397035 + ... + 3397058.

It is an arithmetic number, because the mean of its divisors is an integer number (15852886).

Almost surely, 2^81529116 is an apocalyptic number.

It is an amenable number.

81529116 is an abundant number, since it is smaller than the sum of its proper divisors (108705516).

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

81529116 is a wasteful number, since it uses less digits than its factorization.

81529116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6794100 (or 6794098 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 81529116 is about 9029.3474847300. The cubic root of 81529116 is about 433.6149472546.

The spelling of 81529116 in words is "eighty-one million, five hundred twenty-nine thousand, one hundred sixteen".