81232242 has 64 divisors (see below), whose sum is σ = 205411584. Its totient is φ = 20839680.

The previous prime is 81232237. The next prime is 81232247. The reversal of 81232242 is 24223218.

It is an interprime number because it is at equal distance from previous prime (81232237) and next prime (81232247).

It is not an unprimeable number, because it can be changed into a prime (81232247) 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 31 ways as a sum of consecutive naturals, for example, 18192 + ... + 22212.

It is an arithmetic number, because the mean of its divisors is an integer number (3209556).

Almost surely, 2^81232242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81232242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102705792).

81232242 is an abundant number, since it is smaller than the sum of its proper divisors (124179342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81232242 is a wasteful number, since it uses less digits than its factorization.

81232242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083.

The product of its digits is 1536, while the sum is 24.

The square root of 81232242 is about 9012.8930982232. The cubic root of 81232242 is about 433.0879961682.

The spelling of 81232242 in words is "eighty-one million, two hundred thirty-two thousand, two hundred forty-two".