81329101 has 8 divisors (see below), whose sum is σ = 97839680. Its totient is φ = 66041568.

The previous prime is 81329077. The next prime is 81329107. The reversal of 81329101 is 10192318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81329101 - 2⁵ = 81329069 is a prime.

It is a super-2 number, since 2×81329101² = 13228845338936402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81329107) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 305616 + ... + 305881.

It is an arithmetic number, because the mean of its divisors is an integer number (12229960).

Almost surely, 2^81329101 is an apocalyptic number.

It is an amenable number.

81329101 is a deficient number, since it is larger than the sum of its proper divisors (16510579).

81329101 is a wasteful number, since it uses less digits than its factorization.

81329101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611523.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 81329101 is about 9018.2648552812. The cubic root of 81329101 is about 433.2600617073.

The spelling of 81329101 in words is "eighty-one million, three hundred twenty-nine thousand, one hundred one".