999980087 has 2 divisors, whose sum is σ = 999980088. Its totient is φ = 999980086.

The previous prime is 999980071. The next prime is 999980123. The reversal of 999980087 is 780089999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999980087 - 2⁴ = 999980071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999980057) 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, 499990043 + 499990044.

It is an arithmetic number, because the mean of its divisors is an integer number (499990044).

Almost surely, 2^999980087 is an apocalyptic number.

999980087 is a deficient number, since it is larger than the sum of its proper divisors (1).

999980087 is an equidigital number, since it uses as much as digits as its factorization.

999980087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 999980087 is about 31622.4617479411. The cubic root of 999980087 is about 999.9933622893.

The spelling of 999980087 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, eighty-seven".