168705539 has 2 divisors, whose sum is σ = 168705540. Its totient is φ = 168705538.

The previous prime is 168705517. The next prime is 168705583. The reversal of 168705539 is 935507861.

It is an a-pointer prime, because the next prime (168705583) can be obtained adding 168705539 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168705539 - 2²⁰ = 167656963 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 168705539.

It is not a weakly prime, because it can be changed into another prime (168705139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84352769 + 84352770.

It is an arithmetic number, because the mean of its divisors is an integer number (84352770).

Almost surely, 2^168705539 is an apocalyptic number.

168705539 is a deficient number, since it is larger than the sum of its proper divisors (1).

168705539 is an equidigital number, since it uses as much as digits as its factorization.

168705539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 168705539 is about 12988.6696393434. The cubic root of 168705539 is about 552.5561884666.

The spelling of 168705539 in words is "one hundred sixty-eight million, seven hundred five thousand, five hundred thirty-nine".