163391963 has 16 divisors (see below), whose sum is σ = 201880320. Its totient is φ = 129089376.

The previous prime is 163391957. The next prime is 163391971. The reversal of 163391963 is 369193361.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 163391963 - 2¹⁰ = 163390939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163391963.

It is not an unprimeable number, because it can be changed into a prime (163391903) 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 in 15 ways as a sum of consecutive naturals, for example, 11681 + ... + 21522.

It is an arithmetic number, because the mean of its divisors is an integer number (12617520).

Almost surely, 2^163391963 is an apocalyptic number.

163391963 is a deficient number, since it is larger than the sum of its proper divisors (38488357).

163391963 is a wasteful number, since it uses less digits than its factorization.

163391963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33266.

The product of its digits is 78732, while the sum is 41.

The square root of 163391963 is about 12782.4865734332. The cubic root of 163391963 is about 546.6930634107.

The spelling of 163391963 in words is "one hundred sixty-three million, three hundred ninety-one thousand, nine hundred sixty-three".