168131 has 4 divisors (see below), whose sum is σ = 177000. Its totient is φ = 159264.

The previous prime is 168127. The next prime is 168143. The reversal of 168131 is 131861.

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 168131 - 2² = 168127 is a prime.

It is a super-2 number, since 2×168131² = 56536066322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168151) 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, 4406 + ... + 4443.

It is an arithmetic number, because the mean of its divisors is an integer number (44250).

2¹⁶⁸¹³¹ is an apocalyptic number.

168131 is a deficient number, since it is larger than the sum of its proper divisors (8869).

168131 is an equidigital number, since it uses as much as digits as its factorization.

168131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8868.

The product of its digits is 144, while the sum is 20.

The square root of 168131 is about 410.0378031353. The cubic root of 168131 is about 55.1928218279.

Adding to 168131 its reverse (131861), we get a palindrome (299992).

The spelling of 168131 in words is "one hundred sixty-eight thousand, one hundred thirty-one".