111720911 has 2 divisors, whose sum is σ = 111720912. Its totient is φ = 111720910.

The previous prime is 111720901. The next prime is 111720943. The reversal of 111720911 is 119027111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111720911 - 2²² = 107526607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111720901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55860455 + 55860456.

It is an arithmetic number, because the mean of its divisors is an integer number (55860456).

Almost surely, 2^111720911 is an apocalyptic number.

111720911 is a deficient number, since it is larger than the sum of its proper divisors (1).

111720911 is an equidigital number, since it uses as much as digits as its factorization.

111720911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 23.

The square root of 111720911 is about 10569.8113038975. The cubic root of 111720911 is about 481.6277363575.

The spelling of 111720911 in words is "one hundred eleven million, seven hundred twenty thousand, nine hundred eleven".