131646 has 16 divisors (see below), whose sum is σ = 270864. Its totient is φ = 42624.

The previous prime is 131641. The next prime is 131671. The reversal of 131646 is 646131.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131641) by changing a digit.

131646 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (16929).

2¹³¹⁶⁴⁶ is an apocalyptic number.

131646 is an abundant number, since it is smaller than the sum of its proper divisors (139218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131646 is a wasteful number, since it uses less digits than its factorization.

131646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its digits is 432, while the sum is 21.

The square root of 131646 is about 362.8305389572. The cubic root of 131646 is about 50.8708767413.

Adding to 131646 its reverse (646131), we get a palindrome (777777).

It can be divided in two parts, 131 and 646, that added together give a palindrome (777).

The spelling of 131646 in words is "one hundred thirty-one thousand, six hundred forty-six".