999109087 has 2 divisors, whose sum is σ = 999109088. Its totient is φ = 999109086.

The previous prime is 999109061. The next prime is 999109093. The reversal of 999109087 is 780901999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999109087 - 2¹⁹ = 998584799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999109037) 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, 499554543 + 499554544.

It is an arithmetic number, because the mean of its divisors is an integer number (499554544).

Almost surely, 2^999109087 is an apocalyptic number.

999109087 is a deficient number, since it is larger than the sum of its proper divisors (1).

999109087 is an equidigital number, since it uses as much as digits as its factorization.

999109087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 999109087 is about 31608.6868914227. The cubic root of 999109087 is about 999.7029407645.

The spelling of 999109087 in words is "nine hundred ninety-nine million, one hundred nine thousand, eighty-seven".