163873109 has 2 divisors, whose sum is σ = 163873110. Its totient is φ = 163873108.

The previous prime is 163873079. The next prime is 163873121. The reversal of 163873109 is 901378361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159314884 + 4558225 = 12622^2 + 2135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163873109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163873139) 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, 81936554 + 81936555.

It is an arithmetic number, because the mean of its divisors is an integer number (81936555).

Almost surely, 2^163873109 is an apocalyptic number.

It is an amenable number.

163873109 is a deficient number, since it is larger than the sum of its proper divisors (1).

163873109 is an equidigital number, since it uses as much as digits as its factorization.

163873109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 163873109 is about 12801.2932549801. The cubic root of 163873109 is about 547.2291595644.

It can be divided in two parts, 1638 and 73109, that added together give a palindrome (74747).

The spelling of 163873109 in words is "one hundred sixty-three million, eight hundred seventy-three thousand, one hundred nine".