111264991 has 2 divisors, whose sum is σ = 111264992. Its totient is φ = 111264990.

The previous prime is 111264971. The next prime is 111264997. The reversal of 111264991 is 199462111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111264991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111264997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55632495 + 55632496.

It is an arithmetic number, because the mean of its divisors is an integer number (55632496).

Almost surely, 2^111264991 is an apocalyptic number.

111264991 is a deficient number, since it is larger than the sum of its proper divisors (1).

111264991 is an equidigital number, since it uses as much as digits as its factorization.

111264991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 111264991 is about 10548.2221724801. Note that the first 3 decimals coincide. The cubic root of 111264991 is about 480.9716875983.

The spelling of 111264991 in words is "one hundred eleven million, two hundred sixty-four thousand, nine hundred ninety-one".