168819811 has 2 divisors, whose sum is σ = 168819812. Its totient is φ = 168819810.

The previous prime is 168819803. The next prime is 168819821. The reversal of 168819811 is 118918861.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (118918861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 118618891 and 198816811.

It is a cyclic number.

It is not a de Polignac number, because 168819811 - 2³ = 168819803 is a prime.

It is not a weakly prime, because it can be changed into another prime (168819821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84409905 + 84409906.

It is an arithmetic number, because the mean of its divisors is an integer number (84409906).

Almost surely, 2^168819811 is an apocalyptic number.

168819811 is a deficient number, since it is larger than the sum of its proper divisors (1).

168819811 is an equidigital number, since it uses as much as digits as its factorization.

168819811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 43.

The square root of 168819811 is about 12993.0678055646. The cubic root of 168819811 is about 552.6809175266.

The spelling of 168819811 in words is "one hundred sixty-eight million, eight hundred nineteen thousand, eight hundred eleven".