999910987 has 2 divisors, whose sum is σ = 999910988. Its totient is φ = 999910986.

The previous prime is 999910969. The next prime is 999911021. The reversal of 999910987 is 789019999.

It is a weak prime.

It is an emirp because it is prime and its reverse (789019999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999910987 - 2¹¹ = 999908939 is a prime.

It is not a weakly prime, because it can be changed into another prime (999910907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499955493 + 499955494.

It is an arithmetic number, because the mean of its divisors is an integer number (499955494).

Almost surely, 2^999910987 is an apocalyptic number.

999910987 is a deficient number, since it is larger than the sum of its proper divisors (1).

999910987 is an equidigital number, since it uses as much as digits as its factorization.

999910987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 61.

The square root of 999910987 is about 31621.3691512559. The cubic root of 999910987 is about 999.9703281196.

The spelling of 999910987 in words is "nine hundred ninety-nine million, nine hundred ten thousand, nine hundred eighty-seven".