999989087 has 2 divisors, whose sum is σ = 999989088. Its totient is φ = 999989086.

The previous prime is 999989083. The next prime is 999989141. The reversal of 999989087 is 780989999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999989087 - 2² = 999989083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999989083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499994543 + 499994544.

It is an arithmetic number, because the mean of its divisors is an integer number (499994544).

Almost surely, 2^999989087 is an apocalyptic number.

999989087 is a deficient number, since it is larger than the sum of its proper divisors (1).

999989087 is an equidigital number, since it uses as much as digits as its factorization.

999989087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 68.

The square root of 999989087 is about 31622.6040515325. The cubic root of 999989087 is about 999.9963623201.

The spelling of 999989087 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, eighty-seven".