168094561 has 2 divisors, whose sum is σ = 168094562. Its totient is φ = 168094560.

The previous prime is 168094529. The next prime is 168094571. The reversal of 168094561 is 165490861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126427536 + 41667025 = 11244^2 + 6455^2 .

It is an emirp because it is prime and its reverse (165490861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168094561 - 2⁵ = 168094529 is a prime.

It is not a weakly prime, because it can be changed into another prime (168094571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84047280 + 84047281.

It is an arithmetic number, because the mean of its divisors is an integer number (84047281).

Almost surely, 2^168094561 is an apocalyptic number.

It is an amenable number.

168094561 is a deficient number, since it is larger than the sum of its proper divisors (1).

168094561 is an equidigital number, since it uses as much as digits as its factorization.

168094561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 168094561 is about 12965.1286534303. The cubic root of 168094561 is about 551.8883422987. Note that the first 3 decimals are identical.

The spelling of 168094561 in words is "one hundred sixty-eight million, ninety-four thousand, five hundred sixty-one".