81243041 has 8 divisors (see below), whose sum is σ = 89443200. Its totient is φ = 73178640.

The previous prime is 81243023. The next prime is 81243077. The reversal of 81243041 is 14034218.

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 81243041 - 2¹⁰ = 81242017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81242998 and 81243016.

It is not an unprimeable number, because it can be changed into a prime (81243091) 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, 32681 + ... + 35078.

It is an arithmetic number, because the mean of its divisors is an integer number (11180400).

Almost surely, 2^81243041 is an apocalyptic number.

It is an amenable number.

81243041 is a deficient number, since it is larger than the sum of its proper divisors (8200159).

81243041 is a wasteful number, since it uses less digits than its factorization.

81243041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67879.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81243041 is about 9013.4921645276. The cubic root of 81243041 is about 433.1071868652.

Adding to 81243041 its reverse (14034218), we get a palindrome (95277259).

The spelling of 81243041 in words is "eighty-one million, two hundred forty-three thousand, forty-one".