1009999089787 has 2 divisors, whose sum is σ = 1009999089788. Its totient is φ = 1009999089786.

The previous prime is 1009999089733. The next prime is 1009999089797. The reversal of 1009999089787 is 7879809999001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1009999089787 - 2¹⁵ = 1009999057019 is a prime.

It is a super-2 number, since 2×1009999089787² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1009999089797) 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, 504999544893 + 504999544894.

It is an arithmetic number, because the mean of its divisors is an integer number (504999544894).

Almost surely, 2^{1009999089787} is an apocalyptic number.

1009999089787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009999089787 is an equidigital number, since it uses as much as digits as its factorization.

1009999089787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185177664, while the sum is 76.

The spelling of 1009999089787 in words is "one trillion, nine billion, nine hundred ninety-nine million, eighty-nine thousand, seven hundred eighty-seven".