81705703 has 2 divisors, whose sum is σ = 81705704. Its totient is φ = 81705702.

The previous prime is 81705691. The next prime is 81705707. The reversal of 81705703 is 30750718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81705703 - 2⁹ = 81705191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81705707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40852851 + 40852852.

It is an arithmetic number, because the mean of its divisors is an integer number (40852852).

Almost surely, 2^81705703 is an apocalyptic number.

81705703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81705703 is an equidigital number, since it uses as much as digits as its factorization.

81705703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 81705703 is about 9039.1206983865. The cubic root of 81705703 is about 433.9277825146.

The spelling of 81705703 in words is "eighty-one million, seven hundred five thousand, seven hundred three".