1331331211987 has 8 divisors (see below), whose sum is σ = 1521582834272. Its totient is φ = 1141094952000.

The previous prime is 1331331211979. The next prime is 1331331211993. The reversal of 1331331211987 is 7891121331331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331331211987 - 2³ = 1331331211979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331331211187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3654264 + ... + 4002037.

It is an arithmetic number, because the mean of its divisors is an integer number (190197854284).

Almost surely, 2^{1331331211987} is an apocalyptic number.

1331331211987 is a deficient number, since it is larger than the sum of its proper divisors (190251622285).

1331331211987 is an equidigital number, since it uses as much as digits as its factorization.

1331331211987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681149.

The product of its digits is 81648, while the sum is 43.

The spelling of 1331331211987 in words is "one trillion, three hundred thirty-one billion, three hundred thirty-one million, two hundred eleven thousand, nine hundred eighty-seven".