111921889 has 2 divisors, whose sum is σ = 111921890. Its totient is φ = 111921888.

The previous prime is 111921883. The next prime is 111921911. The reversal of 111921889 is 988129111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102819600 + 9102289 = 10140^2 + 3017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111921889 is a prime.

It is not a weakly prime, because it can be changed into another prime (111921883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55960944 + 55960945.

It is an arithmetic number, because the mean of its divisors is an integer number (55960945).

Almost surely, 2^111921889 is an apocalyptic number.

It is an amenable number.

111921889 is a deficient number, since it is larger than the sum of its proper divisors (1).

111921889 is an equidigital number, since it uses as much as digits as its factorization.

111921889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 40.

The square root of 111921889 is about 10579.3142027260. The cubic root of 111921889 is about 481.9163680705.

The spelling of 111921889 in words is "one hundred eleven million, nine hundred twenty-one thousand, eight hundred eighty-nine".