81755853 has 8 divisors (see below), whose sum is σ = 109740000. Its totient is φ = 54137808.

The previous prime is 81755851. The next prime is 81755893. The reversal of 81755853 is 35855718.

It is a happy number.

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

It is not a de Polignac number, because 81755853 - 2¹ = 81755851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81755851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91003 + ... + 91896.

It is an arithmetic number, because the mean of its divisors is an integer number (13717500).

Almost surely, 2^81755853 is an apocalyptic number.

It is an amenable number.

81755853 is a deficient number, since it is larger than the sum of its proper divisors (27984147).

81755853 is a wasteful number, since it uses less digits than its factorization.

81755853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183051.

The product of its digits is 168000, while the sum is 42.

The square root of 81755853 is about 9041.8943258589. The cubic root of 81755853 is about 434.0165442807.

It can be divided in two parts, 8175 and 5853, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 81755853 in words is "eighty-one million, seven hundred fifty-five thousand, eight hundred fifty-three".