111212117 has 2 divisors, whose sum is σ = 111212118. Its totient is φ = 111212116.

The previous prime is 111212099. The next prime is 111212119. The reversal of 111212117 is 711212111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85951441 + 25260676 = 9271^2 + 5026^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212117 - 2⁶ = 111212053 is a prime.

Together with 111212119, 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 = 111212095 and 111212104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606058 + 55606059.

It is an arithmetic number, because the mean of its divisors is an integer number (55606059).

Almost surely, 2^111212117 is an apocalyptic number.

It is an amenable number.

111212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212117 is an equidigital number, since it uses as much as digits as its factorization.

111212117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28, while the sum is 17.

The square root of 111212117 is about 10545.7155755311. The cubic root of 111212117 is about 480.8954883490.

Adding to 111212117 its reverse (711212111), we get a palindrome (822424228).

The spelling of 111212117 in words is "one hundred eleven million, two hundred twelve thousand, one hundred seventeen".