131986 has 4 divisors (see below), whose sum is σ = 197982. Its totient is φ = 65992.

The previous prime is 131969. The next prime is 132001. The reversal of 131986 is 689131.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 99225 + 32761 = 315^2 + 181^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32995 + ... + 32998.

2^{131986} is an apocalyptic number.

131986 is a deficient number, since it is larger than the sum of its proper divisors (65996).

131986 is an equidigital number, since it uses as much as digits as its factorization.

131986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65995.

The product of its digits is 1296, while the sum is 28.

The square root of 131986 is about 363.2987751149. The cubic root of 131986 is about 50.9146335570.

The spelling of 131986 in words is "one hundred thirty-one thousand, nine hundred eighty-six".

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