81441361 has 2 divisors, whose sum is σ = 81441362. Its totient is φ = 81441360.

The previous prime is 81441313. The next prime is 81441383. The reversal of 81441361 is 16314418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 39450961 = 6480^2 + 6281^2 .

It is a cyclic number.

It is not a de Polignac number, because 81441361 - 2¹¹ = 81439313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81444361) 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 as a sum of consecutive naturals, namely, 40720680 + 40720681.

It is an arithmetic number, because the mean of its divisors is an integer number (40720681).

Almost surely, 2^81441361 is an apocalyptic number.

It is an amenable number.

81441361 is a deficient number, since it is larger than the sum of its proper divisors (1).

81441361 is an equidigital number, since it uses as much as digits as its factorization.

81441361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 81441361 is about 9024.4867444082. The cubic root of 81441361 is about 433.4593155724.

Adding to 81441361 its reverse (16314418), we get a palindrome (97755779).

The spelling of 81441361 in words is "eighty-one million, four hundred forty-one thousand, three hundred sixty-one".