1331329986 has 64 divisors (see below), whose sum is σ = 3385939200. Its totient is φ = 379842048.

The previous prime is 1331329963. The next prime is 1331329997. The reversal of 1331329986 is 6899231331.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320370 + ... + 324498.

It is an arithmetic number, because the mean of its divisors is an integer number (52905300).

Almost surely, 2^1331329986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331329986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692969600).

1331329986 is an abundant number, since it is smaller than the sum of its proper divisors (2054609214).

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

1331329986 is a wasteful number, since it uses less digits than its factorization.

1331329986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000 (or 4994 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 1331329986 is about 36487.3948919349. The cubic root of 1331329986 is about 1100.0908977227.

The spelling of 1331329986 in words is "one billion, three hundred thirty-one million, three hundred twenty-nine thousand, nine hundred eighty-six".