999099887 has 2 divisors, whose sum is σ = 999099888. Its totient is φ = 999099886.

The previous prime is 999099869. The next prime is 999099901. The reversal of 999099887 is 788990999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999099887 - 2⁶ = 999099823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999099817) 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, 499549943 + 499549944.

It is an arithmetic number, because the mean of its divisors is an integer number (499549944).

Almost surely, 2^999099887 is an apocalyptic number.

999099887 is a deficient number, since it is larger than the sum of its proper divisors (1).

999099887 is an equidigital number, since it uses as much as digits as its factorization.

999099887 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 999099887 is about 31608.5413614738. The cubic root of 999099887 is about 999.6998722657.

The spelling of 999099887 in words is "nine hundred ninety-nine million, ninety-nine thousand, eight hundred eighty-seven".