112121209 has 2 divisors, whose sum is σ = 112121210. Its totient is φ = 112121208.

The previous prime is 112121201. The next prime is 112121213. The reversal of 112121209 is 902121211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111767184 + 354025 = 10572^2 + 595^2 .

It is an emirp because it is prime and its reverse (902121211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 112121209 - 2³ = 112121201 is a prime.

It is not a weakly prime, because it can be changed into another prime (112121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56060604 + 56060605.

It is an arithmetic number, because the mean of its divisors is an integer number (56060605).

Almost surely, 2^112121209 is an apocalyptic number.

It is an amenable number.

112121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

112121209 is an equidigital number, since it uses as much as digits as its factorization.

112121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 112121209 is about 10588.7302827110. The cubic root of 112121209 is about 482.2022776049.

It can be divided in two parts, 11212 and 1209, that added together give a palindrome (12421).

The spelling of 112121209 in words is "one hundred twelve million, one hundred twenty-one thousand, two hundred nine".