81755053 has 2 divisors, whose sum is σ = 81755054. Its totient is φ = 81755052.

The previous prime is 81755039. The next prime is 81755077. The reversal of 81755053 is 35055718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81486729 + 268324 = 9027^2 + 518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81755053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81755033) 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 as a sum of consecutive naturals, namely, 40877526 + 40877527.

It is an arithmetic number, because the mean of its divisors is an integer number (40877527).

Almost surely, 2^81755053 is an apocalyptic number.

It is an amenable number.

81755053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81755053 is an equidigital number, since it uses as much as digits as its factorization.

81755053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 81755053 is about 9041.8500872333. The cubic root of 81755053 is about 434.0151286252.

The spelling of 81755053 in words is "eighty-one million, seven hundred fifty-five thousand, fifty-three".