999987211 has 2 divisors, whose sum is σ = 999987212. Its totient is φ = 999987210.

The previous prime is 999987151. The next prime is 999987227. The reversal of 999987211 is 112789999.

999987211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999987211 - 2²⁹ = 463116299 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999987281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993605 + 499993606.

It is an arithmetic number, because the mean of its divisors is an integer number (499993606).

Almost surely, 2^999987211 is an apocalyptic number.

999987211 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987211 is an equidigital number, since it uses as much as digits as its factorization.

999987211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 55.

The square root of 999987211 is about 31622.5743891923. The cubic root of 999987211 is about 999.9957369818.

The spelling of 999987211 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred eleven".