168117121 has 2 divisors, whose sum is σ = 168117122. Its totient is φ = 168117120.

The previous prime is 168117119. The next prime is 168117133. The reversal of 168117121 is 121711861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167987521 + 129600 = 12961^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 168117121 - 2¹ = 168117119 is a prime.

Together with 168117119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 168117121.

It is not a weakly prime, because it can be changed into another prime (168117151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84058560 + 84058561.

It is an arithmetic number, because the mean of its divisors is an integer number (84058561).

Almost surely, 2^168117121 is an apocalyptic number.

It is an amenable number.

168117121 is a deficient number, since it is larger than the sum of its proper divisors (1).

168117121 is an equidigital number, since it uses as much as digits as its factorization.

168117121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 28.

The square root of 168117121 is about 12965.9986503161. The cubic root of 168117121 is about 551.9130308707.

Adding to 168117121 its reverse (121711861), we get a palindrome (289828982).

It can be divided in two parts, 16811 and 7121, that added together give a palindrome (23932).

The spelling of 168117121 in words is "one hundred sixty-eight million, one hundred seventeen thousand, one hundred twenty-one".