111111109997 has 2 divisors, whose sum is σ = 111111109998. Its totient is φ = 111111109996.

The previous prime is 111111109987. The next prime is 111111110009. The reversal of 111111109997 is 799901111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71473883716 + 39637226281 = 267346^2 + 199091^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111109997 - 2⁶ = 111111109933 is a prime.

It is a super-3 number, since 3×111111109997³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111109987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555554998 + 55555554999.

It is an arithmetic number, because the mean of its divisors is an integer number (55555554999).

Almost surely, 2^111111109997 is an apocalyptic number.

It is an amenable number.

111111109997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111109997 is an equidigital number, since it uses as much as digits as its factorization.

111111109997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 41.

The spelling of 111111109997 in words is "one hundred eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-seven".