81241412 has 36 divisors (see below), whose sum is σ = 171099180. Its totient is φ = 33614784.

The previous prime is 81241409. The next prime is 81241417. The reversal of 81241412 is 21414218.

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 66846976 = 3794^2 + 8176^2 .

It is not an unprimeable number, because it can be changed into a prime (81241417) 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 11 ways as a sum of consecutive naturals, for example, 1463 + ... + 12830.

It is an arithmetic number, because the mean of its divisors is an integer number (4752755).

Almost surely, 2^81241412 is an apocalyptic number.

It is an amenable number.

81241412 is an abundant number, since it is smaller than the sum of its proper divisors (89857768).

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

81241412 is a wasteful number, since it uses less digits than its factorization.

81241412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14340 (or 14331 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 81241412 is about 9013.4017995427. The cubic root of 81241412 is about 433.1042921093.

It can be divided in two parts, 812 and 41412, that added together give a palindrome (42224).

The spelling of 81241412 in words is "eighty-one million, two hundred forty-one thousand, four hundred twelve".