163989613 has 2 divisors, whose sum is σ = 163989614. Its totient is φ = 163989612.

The previous prime is 163989601. The next prime is 163989643. The reversal of 163989613 is 316989361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152720164 + 11269449 = 12358^2 + 3357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163989613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163989643) 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, 81994806 + 81994807.

It is an arithmetic number, because the mean of its divisors is an integer number (81994807).

Almost surely, 2^163989613 is an apocalyptic number.

It is an amenable number.

163989613 is a deficient number, since it is larger than the sum of its proper divisors (1).

163989613 is an equidigital number, since it uses as much as digits as its factorization.

163989613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 163989613 is about 12805.8429242280. The cubic root of 163989613 is about 547.3588112684.

The spelling of 163989613 in words is "one hundred sixty-three million, nine hundred eighty-nine thousand, six hundred thirteen".