111281617 has 2 divisors, whose sum is σ = 111281618. Its totient is φ = 111281616.

The previous prime is 111281579. The next prime is 111281627. The reversal of 111281617 is 716182111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71893441 + 39388176 = 8479^2 + 6276^2 .

It is a cyclic number.

It is not a de Polignac number, because 111281617 - 2¹⁵ = 111248849 is a prime.

It is not a weakly prime, because it can be changed into another prime (111281627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55640808 + 55640809.

It is an arithmetic number, because the mean of its divisors is an integer number (55640809).

Almost surely, 2^111281617 is an apocalyptic number.

It is an amenable number.

111281617 is a deficient number, since it is larger than the sum of its proper divisors (1).

111281617 is an equidigital number, since it uses as much as digits as its factorization.

111281617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 28.

The square root of 111281617 is about 10549.0102379323. The cubic root of 111281617 is about 480.9956431329.

The spelling of 111281617 in words is "one hundred eleven million, two hundred eighty-one thousand, six hundred seventeen".