168684121 has 2 divisors, whose sum is σ = 168684122. Its totient is φ = 168684120.

The previous prime is 168684101. The next prime is 168684157. The reversal of 168684121 is 121486861.

168684121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 7901721 = 12680^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 168684121 - 2⁷ = 168683993 is a prime.

It is equal to p_9433567 and since 168684121 and 9433567 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (168684101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84342060 + 84342061.

It is an arithmetic number, because the mean of its divisors is an integer number (84342061).

Almost surely, 2^168684121 is an apocalyptic number.

It is an amenable number.

168684121 is a deficient number, since it is larger than the sum of its proper divisors (1).

168684121 is an equidigital number, since it uses as much as digits as its factorization.

168684121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 168684121 is about 12987.8451253470. The cubic root of 168684121 is about 552.5328042328.

The spelling of 168684121 in words is "one hundred sixty-eight million, six hundred eighty-four thousand, one hundred twenty-one".