81241612 has 12 divisors (see below), whose sum is σ = 148354416. Its totient is φ = 38854640.

The previous prime is 81241609. The next prime is 81241619. The reversal of 81241612 is 21614218.

It is not an unprimeable number, because it can be changed into a prime (81241619) 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, 441439 + ... + 441622.

It is an arithmetic number, because the mean of its divisors is an integer number (12362868).

Almost surely, 2^81241612 is an apocalyptic number.

It is an amenable number.

81241612 is a deficient number, since it is larger than the sum of its proper divisors (67112804).

81241612 is a wasteful number, since it uses less digits than its factorization.

81241612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883088 (or 883086 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 81241612 is about 9013.4128941262. The cubic root of 81241612 is about 433.1046475142.

It can be divided in two parts, 812 and 41612, that added together give a palindrome (42424).

The spelling of 81241612 in words is "eighty-one million, two hundred forty-one thousand, six hundred twelve".