163621189 has 2 divisors, whose sum is σ = 163621190. Its totient is φ = 163621188.

The previous prime is 163621181. The next prime is 163621259. The reversal of 163621189 is 981126361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140896900 + 22724289 = 11870^2 + 4767^2 .

It is an emirp because it is prime and its reverse (981126361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163621189 - 2³ = 163621181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163621181) 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, 81810594 + 81810595.

It is an arithmetic number, because the mean of its divisors is an integer number (81810595).

Almost surely, 2^163621189 is an apocalyptic number.

It is an amenable number.

163621189 is a deficient number, since it is larger than the sum of its proper divisors (1).

163621189 is an equidigital number, since it uses as much as digits as its factorization.

163621189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 163621189 is about 12791.4498396390. The cubic root of 163621189 is about 546.9485996573.

The spelling of 163621189 in words is "one hundred sixty-three million, six hundred twenty-one thousand, one hundred eighty-nine".