81753863 has 2 divisors, whose sum is σ = 81753864. Its totient is φ = 81753862.

The previous prime is 81753857. The next prime is 81753911. The reversal of 81753863 is 36835718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81753863 - 2²⁶ = 14644999 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81753863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81753803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40876931 + 40876932.

It is an arithmetic number, because the mean of its divisors is an integer number (40876932).

Almost surely, 2^81753863 is an apocalyptic number.

81753863 is a deficient number, since it is larger than the sum of its proper divisors (1).

81753863 is an equidigital number, since it uses as much as digits as its factorization.

81753863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 81753863 is about 9041.7842818771. The cubic root of 81753863 is about 434.0130228206.

The spelling of 81753863 in words is "eighty-one million, seven hundred fifty-three thousand, eight hundred sixty-three".