163538 has 4 divisors (see below), whose sum is σ = 245310. Its totient is φ = 81768.

The previous prime is 163517. The next prime is 163543. The reversal of 163538 is 835361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835361 = 43 ⋅19427.

It can be written as a sum of positive squares in only one way, i.e., 157609 + 5929 = 397^2 + 77^2 .

It is an unprimeable number.

163538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40883 + ... + 40886.

2¹⁶³⁵³⁸ is an apocalyptic number.

163538 is a deficient number, since it is larger than the sum of its proper divisors (81772).

163538 is an equidigital number, since it uses as much as digits as its factorization.

163538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81771.

The product of its digits is 2160, while the sum is 26.

The square root of 163538 is about 404.3983184930. The cubic root of 163538 is about 54.6855889944.

Adding to 163538 its reverse (835361), we get a palindrome (998899).

It can be divided in two parts, 16353 and 8, that added together give a palindrome (16361).

The spelling of 163538 in words is "one hundred sixty-three thousand, five hundred thirty-eight".