111619891 has 2 divisors, whose sum is σ = 111619892. Its totient is φ = 111619890.

The previous prime is 111619883. The next prime is 111619901. The reversal of 111619891 is 198916111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111619891 - 2³ = 111619883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111619891.

It is not a weakly prime, because it can be changed into another prime (111619801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55809945 + 55809946.

It is an arithmetic number, because the mean of its divisors is an integer number (55809946).

Almost surely, 2^111619891 is an apocalyptic number.

111619891 is a deficient number, since it is larger than the sum of its proper divisors (1).

111619891 is an equidigital number, since it uses as much as digits as its factorization.

111619891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 37.

The square root of 111619891 is about 10565.0315191200. The cubic root of 111619891 is about 481.4825271767.

The spelling of 111619891 in words is "one hundred eleven million, six hundred nineteen thousand, eight hundred ninety-one".