1001009987 has 2 divisors, whose sum is σ = 1001009988. Its totient is φ = 1001009986.

The previous prime is 1001009983. The next prime is 1001010011. The reversal of 1001009987 is 7899001001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001009987 - 2² = 1001009983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001009983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500504993 + 500504994.

It is an arithmetic number, because the mean of its divisors is an integer number (500504994).

Almost surely, 2^1001009987 is an apocalyptic number.

1001009987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001009987 is an equidigital number, since it uses as much as digits as its factorization.

1001009987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1001009987 is about 31638.7418681590. The cubic root of 1001009987 is about 1000.3365490554.

The spelling of 1001009987 in words is "one billion, one million, nine thousand, nine hundred eighty-seven".