81096929 has 4 divisors (see below), whose sum is σ = 81295620. Its totient is φ = 80898240.

The previous prime is 81096923. The next prime is 81096971. The reversal of 81096929 is 92969018.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78357904 + 2739025 = 8852^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 81096929 - 2⁴ = 81096913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81096929.

It is not an unprimeable number, because it can be changed into a prime (81096923) 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 3 ways as a sum of consecutive naturals, for example, 98732 + ... + 99549.

It is an arithmetic number, because the mean of its divisors is an integer number (20323905).

Almost surely, 2^81096929 is an apocalyptic number.

It is an amenable number.

81096929 is a deficient number, since it is larger than the sum of its proper divisors (198691).

81096929 is a wasteful number, since it uses less digits than its factorization.

81096929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198690.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 81096929 is about 9005.3833344284. The cubic root of 81096929 is about 432.8473897135.

The spelling of 81096929 in words is "eighty-one million, ninety-six thousand, nine hundred twenty-nine".