111779556149 has 2 divisors, whose sum is σ = 111779556150. Its totient is φ = 111779556148.

The previous prime is 111779556131. The next prime is 111779556151. The reversal of 111779556149 is 941655977111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78403920049 + 33375636100 = 280007^2 + 182690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111779556149 is a prime.

Together with 111779556151, 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 = 111779556094 and 111779556103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111779555149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55889778074 + 55889778075.

It is an arithmetic number, because the mean of its divisors is an integer number (55889778075).

Almost surely, 2^111779556149 is an apocalyptic number.

It is an amenable number.

111779556149 is a deficient number, since it is larger than the sum of its proper divisors (1).

111779556149 is an equidigital number, since it uses as much as digits as its factorization.

111779556149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2381400, while the sum is 56.

The spelling of 111779556149 in words is "one hundred eleven billion, seven hundred seventy-nine million, five hundred fifty-six thousand, one hundred forty-nine".