163631 has 8 divisors (see below), whose sum is σ = 181104. Its totient is φ = 146880.

The previous prime is 163627. The next prime is 163633. The reversal of 163631 is 136361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163631 - 2² = 163627 is a prime.

It is a super-2 number, since 2×163631² = 53550208322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 686.

It is an arithmetic number, because the mean of its divisors is an integer number (22638).

2¹⁶³⁶³¹ is an apocalyptic number.

163631 is a deficient number, since it is larger than the sum of its proper divisors (17473).

163631 is a wasteful number, since it uses less digits than its factorization.

163631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its digits is 324, while the sum is 20.

The square root of 163631 is about 404.5132877916. The cubic root of 163631 is about 54.6959531423.

Adding to 163631 its reverse (136361), we get a palindrome (299992).

The spelling of 163631 in words is "one hundred sixty-three thousand, six hundred thirty-one".