168181841 has 2 divisors, whose sum is σ = 168181842. Its totient is φ = 168181840.

The previous prime is 168181831. The next prime is 168181843. The reversal of 168181841 is 148181861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130051216 + 38130625 = 11404^2 + 6175^2 .

It is an emirp because it is prime and its reverse (148181861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168181841 - 2²⁶ = 101072977 is a prime.

Together with 168181843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 168181795 and 168181804.

It is not a weakly prime, because it can be changed into another prime (168181843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84090920 + 84090921.

It is an arithmetic number, because the mean of its divisors is an integer number (84090921).

Almost surely, 2^168181841 is an apocalyptic number.

It is an amenable number.

168181841 is a deficient number, since it is larger than the sum of its proper divisors (1).

168181841 is an equidigital number, since it uses as much as digits as its factorization.

168181841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 38.

The square root of 168181841 is about 12968.4941685610. The cubic root of 168181841 is about 551.9838450516.

The spelling of 168181841 in words is "one hundred sixty-eight million, one hundred eighty-one thousand, eight hundred forty-one".