111818950889 has 2 divisors, whose sum is σ = 111818950890. Its totient is φ = 111818950888.

The previous prime is 111818950883. The next prime is 111818950909. The reversal of 111818950889 is 988059818111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66942765289 + 44876185600 = 258733^2 + 211840^2 .

It is an emirp because it is prime and its reverse (988059818111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111818950889 - 2²⁴ = 111802173673 is a prime.

It is not a weakly prime, because it can be changed into another prime (111818950883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55909475444 + 55909475445.

It is an arithmetic number, because the mean of its divisors is an integer number (55909475445).

Almost surely, 2^111818950889 is an apocalyptic number.

It is an amenable number.

111818950889 is a deficient number, since it is larger than the sum of its proper divisors (1).

111818950889 is an equidigital number, since it uses as much as digits as its factorization.

111818950889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 59.

The spelling of 111818950889 in words is "one hundred eleven billion, eight hundred eighteen million, nine hundred fifty thousand, eight hundred eighty-nine".