81368041 has 4 divisors (see below), whose sum is σ = 81405252. Its totient is φ = 81330832.

The previous prime is 81368033. The next prime is 81368047. The reversal of 81368041 is 14086318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14086318 = 2 ⋅7043159.

It can be written as a sum of positive squares in 2 ways, for example, as 45846441 + 35521600 = 6771^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 81368041 - 2³ = 81368033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81367994 and 81368012.

It is not an unprimeable number, because it can be changed into a prime (81368047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15106 + ... + 19771.

It is an arithmetic number, because the mean of its divisors is an integer number (20351313).

Almost surely, 2^81368041 is an apocalyptic number.

It is an amenable number.

81368041 is a deficient number, since it is larger than the sum of its proper divisors (37211).

81368041 is a wasteful number, since it uses less digits than its factorization.

81368041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37210.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 81368041 is about 9020.4235488141. The cubic root of 81368041 is about 433.3291983169.

The spelling of 81368041 in words is "eighty-one million, three hundred sixty-eight thousand, forty-one".