81232099 has 8 divisors (see below), whose sum is σ = 87688832. Its totient is φ = 74805120.

The previous prime is 81232091. The next prime is 81232127. The reversal of 81232099 is 99023218.

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

It is not a de Polignac number, because 81232099 - 2³ = 81232091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81232091) 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 7 ways as a sum of consecutive naturals, for example, 1587 + ... + 12844.

It is an arithmetic number, because the mean of its divisors is an integer number (10961104).

Almost surely, 2^81232099 is an apocalyptic number.

81232099 is a deficient number, since it is larger than the sum of its proper divisors (6456733).

81232099 is a wasteful number, since it uses less digits than its factorization.

81232099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14877.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 81232099 is about 9012.8851651400. The cubic root of 81232099 is about 433.0877420342.

It can be divided in two parts, 8123209 and 9, that added together give a palindrome (8123218).

The spelling of 81232099 in words is "eighty-one million, two hundred thirty-two thousand, ninety-nine".