111330991 has 2 divisors, whose sum is σ = 111330992. Its totient is φ = 111330990.

The previous prime is 111330959. The next prime is 111330997. The reversal of 111330991 is 199033111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111330991 - 2⁵ = 111330959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111330997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665495 + 55665496.

It is an arithmetic number, because the mean of its divisors is an integer number (55665496).

Almost surely, 2^111330991 is an apocalyptic number.

111330991 is a deficient number, since it is larger than the sum of its proper divisors (1).

111330991 is an equidigital number, since it uses as much as digits as its factorization.

111330991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 111330991 is about 10551.3501979604. The cubic root of 111330991 is about 481.0667694880.

The spelling of 111330991 in words is "one hundred eleven million, three hundred thirty thousand, nine hundred ninety-one".