163243909 has 2 divisors, whose sum is σ = 163243910. Its totient is φ = 163243908.

The previous prime is 163243901. The next prime is 163243943. The reversal of 163243909 is 909342361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160731684 + 2512225 = 12678^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 163243909 - 2³ = 163243901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163243901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81621954 + 81621955.

It is an arithmetic number, because the mean of its divisors is an integer number (81621955).

Almost surely, 2^163243909 is an apocalyptic number.

It is an amenable number.

163243909 is a deficient number, since it is larger than the sum of its proper divisors (1).

163243909 is an equidigital number, since it uses as much as digits as its factorization.

163243909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 163243909 is about 12776.6939777080. The cubic root of 163243909 is about 546.5278889166.

The spelling of 163243909 in words is "one hundred sixty-three million, two hundred forty-three thousand, nine hundred nine".