111111099999869 has 2 divisors, whose sum is σ = 111111099999870. Its totient is φ = 111111099999868.

The previous prime is 111111099999859. The next prime is 111111099999871. The reversal of 111111099999869 is 968999990111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111077898422500 + 33201577369 = 10539350^2 + 182213^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111099999869 - 2²⁴ = 111111083222653 is a prime.

It is a super-2 number, since 2×111111099999869² (a number of 29 digits) contains 22 as substring.

Together with 111111099999871, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111099999796 and 111111099999805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111099999839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555549999934 + 55555549999935.

It is an arithmetic number, because the mean of its divisors is an integer number (55555549999935).

Almost surely, 2^{111111099999869} is an apocalyptic number.

It is an amenable number.

111111099999869 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111099999869 is an equidigital number, since it uses as much as digits as its factorization.

111111099999869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25509168, while the sum is 74.

The spelling of 111111099999869 in words is "one hundred eleven trillion, one hundred eleven billion, ninety-nine million, nine hundred ninety-nine thousand, eight hundred sixty-nine".