111928121 has 2 divisors, whose sum is σ = 111928122. Its totient is φ = 111928120.

The previous prime is 111928109. The next prime is 111928127. The reversal of 111928121 is 121829111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107412496 + 4515625 = 10364^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 111928121 - 2⁶ = 111928057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111928127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55964060 + 55964061.

It is an arithmetic number, because the mean of its divisors is an integer number (55964061).

Almost surely, 2^111928121 is an apocalyptic number.

It is an amenable number.

111928121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111928121 is an equidigital number, since it uses as much as digits as its factorization.

111928121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 26.

The square root of 111928121 is about 10579.6087356764. The cubic root of 111928121 is about 481.9253125439.

The spelling of 111928121 in words is "one hundred eleven million, nine hundred twenty-eight thousand, one hundred twenty-one".