81744241 has 8 divisors (see below), whose sum is σ = 84491264. Its totient is φ = 79004160.

The previous prime is 81744203. The next prime is 81744259. The reversal of 81744241 is 14244718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81744241 - 2¹³ = 81736049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81744541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34600 + ... + 36886.

It is an arithmetic number, because the mean of its divisors is an integer number (10561408).

Almost surely, 2^81744241 is an apocalyptic number.

It is an amenable number.

81744241 is a deficient number, since it is larger than the sum of its proper divisors (2747023).

81744241 is a wasteful number, since it uses less digits than its factorization.

81744241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471.

The product of its digits is 7168, while the sum is 31.

The square root of 81744241 is about 9041.2521809758. The cubic root of 81744241 is about 433.9959951353.

Adding to 81744241 its reverse (14244718), we get a palindrome (95988959).

The spelling of 81744241 in words is "eighty-one million, seven hundred forty-four thousand, two hundred forty-one".