1331332987 has 2 divisors, whose sum is σ = 1331332988. Its totient is φ = 1331332986.

The previous prime is 1331332939. The next prime is 1331333041. The reversal of 1331332987 is 7892331331.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331332987 - 2⁷ = 1331332859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331332787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665666493 + 665666494.

It is an arithmetic number, because the mean of its divisors is an integer number (665666494).

Almost surely, 2^1331332987 is an apocalyptic number.

1331332987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331332987 is an equidigital number, since it uses as much as digits as its factorization.

1331332987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 1331332987 is about 36487.4360157027. The cubic root of 1331332987 is about 1100.0917243072.

The spelling of 1331332987 in words is "one billion, three hundred thirty-one million, three hundred thirty-two thousand, nine hundred eighty-seven".