163634389 has 2 divisors, whose sum is σ = 163634390. Its totient is φ = 163634388.

The previous prime is 163634381. The next prime is 163634411. The reversal of 163634389 is 983436361.

163634389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154380625 + 9253764 = 12425^2 + 3042^2 .

It is a cyclic number.

It is not a de Polignac number, because 163634389 - 2³ = 163634381 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163634381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81817194 + 81817195.

It is an arithmetic number, because the mean of its divisors is an integer number (81817195).

Almost surely, 2^163634389 is an apocalyptic number.

It is an amenable number.

163634389 is a deficient number, since it is larger than the sum of its proper divisors (1).

163634389 is an equidigital number, since it uses as much as digits as its factorization.

163634389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 43.

The square root of 163634389 is about 12791.9657988911. The cubic root of 163634389 is about 546.9633074659.

The spelling of 163634389 in words is "one hundred sixty-three million, six hundred thirty-four thousand, three hundred eighty-nine".