163645109 has 2 divisors, whose sum is σ = 163645110. Its totient is φ = 163645108.

The previous prime is 163645099. The next prime is 163645123. The reversal of 163645109 is 901546361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163584100 + 61009 = 12790^2 + 247^2 .

It is an emirp because it is prime and its reverse (901546361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163645109 - 2¹⁶ = 163579573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163645129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81822554 + 81822555.

It is an arithmetic number, because the mean of its divisors is an integer number (81822555).

Almost surely, 2^163645109 is an apocalyptic number.

It is an amenable number.

163645109 is a deficient number, since it is larger than the sum of its proper divisors (1).

163645109 is an equidigital number, since it uses as much as digits as its factorization.

163645109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 163645109 is about 12792.3848050315. The cubic root of 163645109 is about 546.9752514072.

The spelling of 163645109 in words is "one hundred sixty-three million, six hundred forty-five thousand, one hundred nine".