81758541 has 8 divisors (see below), whose sum is σ = 109844064. Its totient is φ = 54089360.

The previous prime is 81758531. The next prime is 81758543. The reversal of 81758541 is 14585718.

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 81758541 - 2⁶ = 81758477 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81758541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81758543) 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, 103626 + ... + 104411.

It is an arithmetic number, because the mean of its divisors is an integer number (13730508).

Almost surely, 2^81758541 is an apocalyptic number.

It is an amenable number.

81758541 is a deficient number, since it is larger than the sum of its proper divisors (28085523).

81758541 is a wasteful number, since it uses less digits than its factorization.

81758541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208171.

The product of its digits is 44800, while the sum is 39.

The square root of 81758541 is about 9042.0429660558. The cubic root of 81758541 is about 434.0213008155.

The spelling of 81758541 in words is "eighty-one million, seven hundred fifty-eight thousand, five hundred forty-one".