131678 has 4 divisors (see below), whose sum is σ = 197520. Its totient is φ = 65838.

The previous prime is 131671. The next prime is 131687. The reversal of 131678 is 876131.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131671) 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 as a sum of consecutive naturals, namely, 32918 + ... + 32921.

It is an arithmetic number, because the mean of its divisors is an integer number (49380).

2¹³¹⁶⁷⁸ is an apocalyptic number.

131678 is a deficient number, since it is larger than the sum of its proper divisors (65842).

131678 is an equidigital number, since it uses as much as digits as its factorization.

131678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65841.

The product of its digits is 1008, while the sum is 26.

The square root of 131678 is about 362.8746339991. The cubic root of 131678 is about 50.8749982392.

The spelling of 131678 in words is "one hundred thirty-one thousand, six hundred seventy-eight".