168543121 has 2 divisors, whose sum is σ = 168543122. Its totient is φ = 168543120.

The previous prime is 168543079. The next prime is 168543131. The reversal of 168543121 is 121345861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130782096 + 37761025 = 11436^2 + 6145^2 .

It is a cyclic number.

It is not a de Polignac number, because 168543121 - 2¹¹ = 168541073 is a prime.

It is not a weakly prime, because it can be changed into another prime (168543131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84271560 + 84271561.

It is an arithmetic number, because the mean of its divisors is an integer number (84271561).

Almost surely, 2^168543121 is an apocalyptic number.

It is an amenable number.

168543121 is a deficient number, since it is larger than the sum of its proper divisors (1).

168543121 is an equidigital number, since it uses as much as digits as its factorization.

168543121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 168543121 is about 12982.4158383561. The cubic root of 168543121 is about 552.3788105985.

Adding to 168543121 its reverse (121345861), we get a palindrome (289888982).

The spelling of 168543121 in words is "one hundred sixty-eight million, five hundred forty-three thousand, one hundred twenty-one".