1331335987 has 2 divisors, whose sum is σ = 1331335988. Its totient is φ = 1331335986.

The previous prime is 1331335963. The next prime is 1331336021. The reversal of 1331335987 is 7895331331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331335987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331335937) 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 as a sum of consecutive naturals, namely, 665667993 + 665667994.

It is an arithmetic number, because the mean of its divisors is an integer number (665667994).

Almost surely, 2^1331335987 is an apocalyptic number.

1331335987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331335987 is an equidigital number, since it uses as much as digits as its factorization.

1331335987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 1331335987 is about 36487.4771257208. The cubic root of 1331335987 is about 1100.0925506151.

The spelling of 1331335987 in words is "one billion, three hundred thirty-one million, three hundred thirty-five thousand, nine hundred eighty-seven".