1099999999999 has 2 divisors, whose sum is σ = 1100000000000. Its totient is φ = 1099999999998.

The previous prime is 1099999999981. The next prime is 1100000000003. The reversal of 1099999999999 is 9999999999901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1099999999999 - 2²⁷ = 1099865782271 is a prime.

It is a super-9 number, since 9×1099999999999⁹ (a number of 110 digits) contains 999999999 as substring.

1099999999999 is a modest number, since divided by 9999999 gives 109999 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099999999799) by changing a digit.

Being equal to 11×10¹¹-1, it is a generalized Woodall number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549999999999 + 550000000000.

It is an arithmetic number, because the mean of its divisors is an integer number (550000000000).

Almost surely, 2^{1099999999999} is an apocalyptic number.

1099999999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099999999999 is an equidigital number, since it uses as much as digits as its factorization.

1099999999999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31381059609, while the sum is 100.

It can be divided in two parts, 1099 and 999999999, that multiplied together give a palindrome (1098999998901).

The spelling of 1099999999999 in words is "one trillion, ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".