1331311986 has 24 divisors (see below), whose sum is σ = 2910040380. Its totient is φ = 439842816.

The previous prime is 1331311979. The next prime is 1331311987. The reversal of 1331311986 is 6891131331.

1331311986 is a `hidden beast` number, since 1 + 331 + 311 + 9 + 8 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1175186961 + 156125025 = 34281^2 + 12495^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1331311986.

It is not an unprimeable number, because it can be changed into a prime (1331311987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325231 + ... + 329298.

Almost surely, 2^1331311986 is an apocalyptic number.

1331311986 is an abundant number, since it is smaller than the sum of its proper divisors (1578728394).

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

1331311986 is a wasteful number, since it uses less digits than its factorization.

1331311986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654650 (or 654647 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 1331311986 is about 36487.1482305757. The cubic root of 1331311986 is about 1100.0859398421.

The spelling of 1331311986 in words is "one billion, three hundred thirty-one million, three hundred eleven thousand, nine hundred eighty-six".