163113221 has 2 divisors, whose sum is σ = 163113222. Its totient is φ = 163113220.

The previous prime is 163113193. The next prime is 163113239. The reversal of 163113221 is 122311361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161010721 + 2102500 = 12689^2 + 1450^2 .

It is an emirp because it is prime and its reverse (122311361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163113221 - 2¹⁰ = 163112197 is a prime.

It is a super-3 number, since 3×163113221³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 163113193 and 163113202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163113241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81556610 + 81556611.

It is an arithmetic number, because the mean of its divisors is an integer number (81556611).

Almost surely, 2^163113221 is an apocalyptic number.

It is an amenable number.

163113221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163113221 is an equidigital number, since it uses as much as digits as its factorization.

163113221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 163113221 is about 12771.5786416559. The cubic root of 163113221 is about 546.3820055658.

Adding to 163113221 its reverse (122311361), we get a palindrome (285424582).

The spelling of 163113221 in words is "one hundred sixty-three million, one hundred thirteen thousand, two hundred twenty-one".