163840811 has 2 divisors, whose sum is σ = 163840812. Its totient is φ = 163840810.

The previous prime is 163840769. The next prime is 163840813. The reversal of 163840811 is 118048361.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (118048361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163840811 is a prime.

It is a super-2 number, since 2×163840811² = 53687622698275442, which contains 22 as substring.

Together with 163840813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163840813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81920405 + 81920406.

It is an arithmetic number, because the mean of its divisors is an integer number (81920406).

Almost surely, 2^163840811 is an apocalyptic number.

163840811 is a deficient number, since it is larger than the sum of its proper divisors (1).

163840811 is an equidigital number, since it uses as much as digits as its factorization.

163840811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 163840811 is about 12800.0316796483. The cubic root of 163840811 is about 547.1932057934.

The spelling of 163840811 in words is "one hundred sixty-three million, eight hundred forty thousand, eight hundred eleven".