163641523 has 2 divisors, whose sum is σ = 163641524. Its totient is φ = 163641522.

The previous prime is 163641521. The next prime is 163641539. The reversal of 163641523 is 325146361.

163641523 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 is a cyclic number.

It is not a de Polignac number, because 163641523 - 2¹ = 163641521 is a prime.

Together with 163641521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (163641521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81820761 + 81820762.

It is an arithmetic number, because the mean of its divisors is an integer number (81820762).

Almost surely, 2^163641523 is an apocalyptic number.

163641523 is a deficient number, since it is larger than the sum of its proper divisors (1).

163641523 is an equidigital number, since it uses as much as digits as its factorization.

163641523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 163641523 is about 12792.2446427513. The cubic root of 163641523 is about 546.9712560386.

Adding to 163641523 its reverse (325146361), we get a palindrome (488787884).

The spelling of 163641523 in words is "one hundred sixty-three million, six hundred forty-one thousand, five hundred twenty-three".