131331986 has 24 divisors (see below), whose sum is σ = 203696724. Its totient is φ = 63498240.

The previous prime is 131331961. The next prime is 131331997. The reversal of 131331986 is 689133131.

It can be written as a sum of positive squares in 6 ways, for example, as 106481761 + 24850225 = 10319^2 + 4985^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 544826 + ... + 545066.

Almost surely, 2^131331986 is an apocalyptic number.

131331986 is a deficient number, since it is larger than the sum of its proper divisors (72364738).

131331986 is an equidigital number, since it uses as much as digits as its factorization.

131331986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 393 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 131331986 is about 11460.0168411744. The cubic root of 131331986 is about 508.3039726002.

The spelling of 131331986 in words is "one hundred thirty-one million, three hundred thirty-one thousand, nine hundred eighty-six".