168517109 has 2 divisors, whose sum is σ = 168517110. Its totient is φ = 168517108.

The previous prime is 168517091. The next prime is 168517117. The reversal of 168517109 is 901715861.

Together with previous prime (168517091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139594225 + 28922884 = 11815^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 168517109 - 2¹² = 168513013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168517169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84258554 + 84258555.

It is an arithmetic number, because the mean of its divisors is an integer number (84258555).

Almost surely, 2^168517109 is an apocalyptic number.

It is an amenable number.

168517109 is a deficient number, since it is larger than the sum of its proper divisors (1).

168517109 is an equidigital number, since it uses as much as digits as its factorization.

168517109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 168517109 is about 12981.4139830760. The cubic root of 168517109 is about 552.3503921206.

The spelling of 168517109 in words is "one hundred sixty-eight million, five hundred seventeen thousand, one hundred nine".