163821373 has 2 divisors, whose sum is σ = 163821374. Its totient is φ = 163821372.

The previous prime is 163821331. The next prime is 163821379. The reversal of 163821373 is 373128361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154803364 + 9018009 = 12442^2 + 3003^2 .

It is an emirp because it is prime and its reverse (373128361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163821373 - 2⁹ = 163820861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163821379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81910686 + 81910687.

It is an arithmetic number, because the mean of its divisors is an integer number (81910687).

Almost surely, 2^163821373 is an apocalyptic number.

It is an amenable number.

163821373 is a deficient number, since it is larger than the sum of its proper divisors (1).

163821373 is an equidigital number, since it uses as much as digits as its factorization.

163821373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 163821373 is about 12799.2723621306. The cubic root of 163821373 is about 547.1715653525.

The spelling of 163821373 in words is "one hundred sixty-three million, eight hundred twenty-one thousand, three hundred seventy-three".