81329102 has 4 divisors (see below), whose sum is σ = 121993656. Its totient is φ = 40664550.

The previous prime is 81329077. The next prime is 81329107. The reversal of 81329102 is 20192318.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×81329102² = 13228845664252808, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 20332274 + ... + 20332277.

It is an arithmetic number, because the mean of its divisors is an integer number (30498414).

Almost surely, 2^81329102 is an apocalyptic number.

81329102 is a deficient number, since it is larger than the sum of its proper divisors (40664554).

81329102 is a wasteful number, since it uses less digits than its factorization.

81329102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40664553.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 81329102 is about 9018.2649107242. The cubic root of 81329102 is about 433.2600634831.

The spelling of 81329102 in words is "eighty-one million, three hundred twenty-nine thousand, one hundred two".