111111984817 has 2 divisors, whose sum is σ = 111111984818. Its totient is φ = 111111984816.

The previous prime is 111111984791. The next prime is 111111984827. The reversal of 111111984817 is 718489111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110914975521 + 197009296 = 333039^2 + 14036^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111984817 - 2⁷ = 111111984689 is a prime.

It is not a weakly prime, because it can be changed into another prime (111111984827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555992408 + 55555992409.

It is an arithmetic number, because the mean of its divisors is an integer number (55555992409).

Almost surely, 2^111111984817 is an apocalyptic number.

It is an amenable number.

111111984817 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111984817 is an equidigital number, since it uses as much as digits as its factorization.

111111984817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 43.

The spelling of 111111984817 in words is "one hundred eleven billion, one hundred eleven million, nine hundred eighty-four thousand, eight hundred seventeen".