163634 has 4 divisors (see below), whose sum is σ = 245454. Its totient is φ = 81816.

The previous prime is 163633. The next prime is 163637. The reversal of 163634 is 436361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 436361 = 131 ⋅3331.

It can be written as a sum of positive squares in only one way, i.e., 162409 + 1225 = 403^2 + 35^2 .

It is an Ulam number.

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

It is not an unprimeable number, because it can be changed into a prime (163633) by changing a digit.

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, 40907 + ... + 40910.

2¹⁶³⁶³⁴ is an apocalyptic number.

163634 is a deficient number, since it is larger than the sum of its proper divisors (81820).

163634 is an equidigital number, since it uses as much as digits as its factorization.

163634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81819.

The product of its digits is 1296, while the sum is 23.

The square root of 163634 is about 404.5169959347. The cubic root of 163634 is about 54.6962874043.

Adding to 163634 its reverse (436361), we get a palindrome (599995).

It can be divided in two parts, 163 and 634, that added together give a palindrome (797).

The spelling of 163634 in words is "one hundred sixty-three thousand, six hundred thirty-four".