111619979 has 2 divisors, whose sum is σ = 111619980. Its totient is φ = 111619978.

The previous prime is 111619903. The next prime is 111620017. The reversal of 111619979 is 979916111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111619979 is a prime.

It is not a weakly prime, because it can be changed into another prime (111619279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55809989 + 55809990.

It is an arithmetic number, because the mean of its divisors is an integer number (55809990).

Almost surely, 2^111619979 is an apocalyptic number.

111619979 is a deficient number, since it is larger than the sum of its proper divisors (1).

111619979 is an equidigital number, since it uses as much as digits as its factorization.

111619979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 44.

The square root of 111619979 is about 10565.0356838015. The cubic root of 111619979 is about 481.4826537087.

The spelling of 111619979 in words is "one hundred eleven million, six hundred nineteen thousand, nine hundred seventy-nine".