163421749 has 2 divisors, whose sum is σ = 163421750. Its totient is φ = 163421748.

The previous prime is 163421743. The next prime is 163421761. The reversal of 163421749 is 947124361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135140625 + 28281124 = 11625^2 + 5318^2 .

It is an emirp because it is prime and its reverse (947124361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163421749 - 2¹¹ = 163419701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163421743) 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, 81710874 + 81710875.

It is an arithmetic number, because the mean of its divisors is an integer number (81710875).

Almost surely, 2^163421749 is an apocalyptic number.

It is an amenable number.

163421749 is a deficient number, since it is larger than the sum of its proper divisors (1).

163421749 is an equidigital number, since it uses as much as digits as its factorization.

163421749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 163421749 is about 12783.6516301095. The cubic root of 163421749 is about 546.7262817117.

The spelling of 163421749 in words is "one hundred sixty-three million, four hundred twenty-one thousand, seven hundred forty-nine".