81703871 has 2 divisors, whose sum is σ = 81703872. Its totient is φ = 81703870.

The previous prime is 81703861. The next prime is 81703931. The reversal of 81703871 is 17830718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81703871 - 2¹⁸ = 81441727 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4763168 and since 81703871 and 4763168 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81703861) 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, 40851935 + 40851936.

It is an arithmetic number, because the mean of its divisors is an integer number (40851936).

Almost surely, 2^81703871 is an apocalyptic number.

81703871 is a deficient number, since it is larger than the sum of its proper divisors (1).

81703871 is an equidigital number, since it uses as much as digits as its factorization.

81703871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 81703871 is about 9039.0193605280. The cubic root of 81703871 is about 433.9245393235.

The spelling of 81703871 in words is "eighty-one million, seven hundred three thousand, eight hundred seventy-one".