111921911 has 2 divisors, whose sum is σ = 111921912. Its totient is φ = 111921910.

The previous prime is 111921889. The next prime is 111921917. The reversal of 111921911 is 119129111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111921911 - 2¹⁴ = 111905527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111921917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55960955 + 55960956.

It is an arithmetic number, because the mean of its divisors is an integer number (55960956).

Almost surely, 2^111921911 is an apocalyptic number.

111921911 is a deficient number, since it is larger than the sum of its proper divisors (1).

111921911 is an equidigital number, since it uses as much as digits as its factorization.

111921911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 26.

The square root of 111921911 is about 10579.3152424909. The cubic root of 111921911 is about 481.9163996466.

The spelling of 111921911 in words is "one hundred eleven million, nine hundred twenty-one thousand, nine hundred eleven".