81768541 has 8 divisors (see below), whose sum is σ = 83223360. Its totient is φ = 80322912.

The previous prime is 81768517. The next prime is 81768551. The reversal of 81768541 is 14586718.

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 81768541 - 2⁵ = 81768509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81768494 and 81768503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81768551) 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, 17070 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (10402920).

Almost surely, 2^81768541 is an apocalyptic number.

It is an amenable number.

81768541 is a deficient number, since it is larger than the sum of its proper divisors (1454819).

81768541 is a wasteful number, since it uses less digits than its factorization.

81768541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595.

The product of its digits is 53760, while the sum is 40.

The square root of 81768541 is about 9042.5959215261. The cubic root of 81768541 is about 434.0389953423.

The spelling of 81768541 in words is "eighty-one million, seven hundred sixty-eight thousand, five hundred forty-one".