111611917 has 2 divisors, whose sum is σ = 111611918. Its totient is φ = 111611916.

The previous prime is 111611897. The next prime is 111611921. The reversal of 111611917 is 719116111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88849476 + 22762441 = 9426^2 + 4771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111611917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111611957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55805958 + 55805959.

It is an arithmetic number, because the mean of its divisors is an integer number (55805959).

Almost surely, 2^111611917 is an apocalyptic number.

It is an amenable number.

111611917 is a deficient number, since it is larger than the sum of its proper divisors (1).

111611917 is an equidigital number, since it uses as much as digits as its factorization.

111611917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 28.

The square root of 111611917 is about 10564.6541353705. The cubic root of 111611917 is about 481.4710613795.

The spelling of 111611917 in words is "one hundred eleven million, six hundred eleven thousand, nine hundred seventeen".