1319999987 has 2 divisors, whose sum is σ = 1319999988. Its totient is φ = 1319999986.

The previous prime is 1319999963. The next prime is 1320000001. The reversal of 1319999987 is 7899999131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1319999987 - 2¹⁰ = 1319998963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1319999957) 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, 659999993 + 659999994.

It is an arithmetic number, because the mean of its divisors is an integer number (659999994).

Almost surely, 2^1319999987 is an apocalyptic number.

1319999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1319999987 is an equidigital number, since it uses as much as digits as its factorization.

1319999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 65.

The square root of 1319999987 is about 36331.8040702633. The cubic root of 1319999987 is about 1096.9613068854.

The spelling of 1319999987 in words is "one billion, three hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-seven".