163931 has 4 divisors (see below), whose sum is σ = 173592. Its totient is φ = 154272.

The previous prime is 163927. The next prime is 163973. The reversal of 163931 is 139361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163931 - 2² = 163927 is a prime.

It is a super-2 number, since 2×163931² = 53746745522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 163897 and 163906.

It is not an unprimeable number, because it can be changed into a prime (163901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4805 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (43398).

2¹⁶³⁹³¹ is an apocalyptic number.

163931 is a deficient number, since it is larger than the sum of its proper divisors (9661).

163931 is an equidigital number, since it uses as much as digits as its factorization.

163931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660.

The product of its digits is 486, while the sum is 23.

The square root of 163931 is about 404.8839339860. The cubic root of 163931 is about 54.7293591355.

The spelling of 163931 in words is "one hundred sixty-three thousand, nine hundred thirty-one".