81096321 has 16 divisors (see below), whose sum is σ = 113040000. Its totient is φ = 51617280.

The previous prime is 81096299. The next prime is 81096359. The reversal of 81096321 is 12369018.

It is not a de Polignac number, because 81096321 - 2¹⁰ = 81095297 is a prime.

It is a super-2 number, since 2×81096321² = 13153226559470082, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (81096391) 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 15 ways as a sum of consecutive naturals, for example, 64305 + ... + 65553.

It is an arithmetic number, because the mean of its divisors is an integer number (7065000).

Almost surely, 2^81096321 is an apocalyptic number.

It is an amenable number.

81096321 is a deficient number, since it is larger than the sum of its proper divisors (31943679).

81096321 is a wasteful number, since it uses less digits than its factorization.

81096321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81096321 is about 9005.3495767793. The cubic root of 81096321 is about 432.8463079961.

The spelling of 81096321 in words is "eighty-one million, ninety-six thousand, three hundred twenty-one".