81708059 has 2 divisors, whose sum is σ = 81708060. Its totient is φ = 81708058.

The previous prime is 81707987. The next prime is 81708079. The reversal of 81708059 is 95080718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81708059 - 2¹⁶ = 81642523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81708079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40854029 + 40854030.

It is an arithmetic number, because the mean of its divisors is an integer number (40854030).

Almost surely, 2^81708059 is an apocalyptic number.

81708059 is a deficient number, since it is larger than the sum of its proper divisors (1).

81708059 is an equidigital number, since it uses as much as digits as its factorization.

81708059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 81708059 is about 9039.2510198578. The cubic root of 81708059 is about 433.9319532722.

The spelling of 81708059 in words is "eighty-one million, seven hundred eight thousand, fifty-nine".