81112441 has 2 divisors, whose sum is σ = 81112442. Its totient is φ = 81112440.

The previous prime is 81112439. The next prime is 81112453. The reversal of 81112441 is 14421118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80622441 + 490000 = 8979^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 81112441 - 2¹ = 81112439 is a prime.

Together with 81112439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81112481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40556220 + 40556221.

It is an arithmetic number, because the mean of its divisors is an integer number (40556221).

Almost surely, 2^81112441 is an apocalyptic number.

It is an amenable number.

81112441 is a deficient number, since it is larger than the sum of its proper divisors (1).

81112441 is an equidigital number, since it uses as much as digits as its factorization.

81112441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 22.

The square root of 81112441 is about 9006.2445558623. The cubic root of 81112441 is about 432.8749859112.

Adding to 81112441 its reverse (14421118), we get a palindrome (95533559).

The spelling of 81112441 in words is "eighty-one million, one hundred twelve thousand, four hundred forty-one".