163709969 has 2 divisors, whose sum is σ = 163709970. Its totient is φ = 163709968.

The previous prime is 163709963. The next prime is 163709971. The reversal of 163709969 is 969907361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 18386944 = 12055^2 + 4288^2 .

It is an emirp because it is prime and its reverse (969907361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163709969 - 2²⁰ = 162661393 is a prime.

It is a super-2 number, since 2×163709969² = 53601907899961922, which contains 22 as substring.

Together with 163709971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163709963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81854984 + 81854985.

It is an arithmetic number, because the mean of its divisors is an integer number (81854985).

Almost surely, 2^163709969 is an apocalyptic number.

It is an amenable number.

163709969 is a deficient number, since it is larger than the sum of its proper divisors (1).

163709969 is an equidigital number, since it uses as much as digits as its factorization.

163709969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 163709969 is about 12794.9196558634. The cubic root of 163709969 is about 547.0475055859.

The spelling of 163709969 in words is "one hundred sixty-three million, seven hundred nine thousand, nine hundred sixty-nine".