163442989 has 2 divisors, whose sum is σ = 163442990. Its totient is φ = 163442988.

The previous prime is 163442977. The next prime is 163442999. The reversal of 163442989 is 989244361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106440489 + 57002500 = 10317^2 + 7550^2 .

It is a cyclic number.

It is not a de Polignac number, because 163442989 - 2¹³ = 163434797 is a prime.

It is a super-2 number, since 2×163442989² = 53427221306508242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163442999) 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, 81721494 + 81721495.

It is an arithmetic number, because the mean of its divisors is an integer number (81721495).

Almost surely, 2^163442989 is an apocalyptic number.

It is an amenable number.

163442989 is a deficient number, since it is larger than the sum of its proper divisors (1).

163442989 is an equidigital number, since it uses as much as digits as its factorization.

163442989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 163442989 is about 12784.4823516637. The cubic root of 163442989 is about 546.7499667745.

The spelling of 163442989 in words is "one hundred sixty-three million, four hundred forty-two thousand, nine hundred eighty-nine".