111111099999997 has 2 divisors, whose sum is σ = 111111099999998. Its totient is φ = 111111099999996.

The previous prime is 111111099999979. The next prime is 111111100000007. The reversal of 111111099999997 is 799999990111111.

It is a happy number.

Together with previous prime (111111099999979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105486333587716 + 5624766412281 = 10270654^2 + 2371659^2 .

It is an emirp because it is prime and its reverse (799999990111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111111099999997 - 2⁷ = 111111099999869 is a prime.

It is a super-3 number, since 3×111111099999997³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111099999797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555549999998 + 55555549999999.

It is an arithmetic number, because the mean of its divisors is an integer number (55555549999999).

Almost surely, 2^{111111099999997} is an apocalyptic number.

It is an amenable number.

111111099999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111099999997 is an equidigital number, since it uses as much as digits as its factorization.

111111099999997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33480783, while the sum is 76.

The spelling of 111111099999997 in words is "one hundred eleven trillion, one hundred eleven billion, ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".