163020989 has 2 divisors, whose sum is σ = 163020990. Its totient is φ = 163020988.

The previous prime is 163020937. The next prime is 163021021. The reversal of 163020989 is 989020361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120340900 + 42680089 = 10970^2 + 6533^2 .

It is a cyclic number.

It is not a de Polignac number, because 163020989 - 2⁸ = 163020733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163020929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81510494 + 81510495.

It is an arithmetic number, because the mean of its divisors is an integer number (81510495).

Almost surely, 2^163020989 is an apocalyptic number.

It is an amenable number.

163020989 is a deficient number, since it is larger than the sum of its proper divisors (1).

163020989 is an equidigital number, since it uses as much as digits as its factorization.

163020989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 163020989 is about 12767.9673010233. The cubic root of 163020989 is about 546.2790026615.

The spelling of 163020989 in words is "one hundred sixty-three million, twenty thousand, nine hundred eighty-nine".