1001000999987 has 2 divisors, whose sum is σ = 1001000999988. Its totient is φ = 1001000999986.

The previous prime is 1001000999959. The next prime is 1001001000019. The reversal of 1001000999987 is 7899990001001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001000999987 - 2¹⁴ = 1001000983603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001000999587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500500499993 + 500500499994.

It is an arithmetic number, because the mean of its divisors is an integer number (500500499994).

Almost surely, 2^{1001000999987} is an apocalyptic number.

1001000999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001000999987 is an equidigital number, since it uses as much as digits as its factorization.

1001000999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 53.

The spelling of 1001000999987 in words is "one trillion, one billion, nine hundred ninety-nine thousand, nine hundred eighty-seven".