111871217 has 2 divisors, whose sum is σ = 111871218. Its totient is φ = 111871216.

The previous prime is 111871211. The next prime is 111871223. The reversal of 111871217 is 712178111.

It is a balanced prime because it is at equal distance from previous prime (111871211) and next prime (111871223).

It can be written as a sum of positive squares in only one way, i.e., 96746896 + 15124321 = 9836^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 111871217 - 2²⁴ = 95094001 is a prime.

It is a super-2 number, since 2×111871217² = 25030338386122178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111871217.

It is not a weakly prime, because it can be changed into another prime (111871211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55935608 + 55935609.

It is an arithmetic number, because the mean of its divisors is an integer number (55935609).

Almost surely, 2^111871217 is an apocalyptic number.

It is an amenable number.

111871217 is a deficient number, since it is larger than the sum of its proper divisors (1).

111871217 is an equidigital number, since it uses as much as digits as its factorization.

111871217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 29.

The square root of 111871217 is about 10576.9190693699. The cubic root of 111871217 is about 481.8436287918.

The spelling of 111871217 in words is "one hundred eleven million, eight hundred seventy-one thousand, two hundred seventeen".