113181209 has 2 divisors, whose sum is σ = 113181210. Its totient is φ = 113181208.

The previous prime is 113181199. The next prime is 113181221. The reversal of 113181209 is 902181311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80371225 + 32809984 = 8965^2 + 5728^2 .

It is an emirp because it is prime and its reverse (902181311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113181209 - 2⁴ = 113181193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (113181239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56590604 + 56590605.

It is an arithmetic number, because the mean of its divisors is an integer number (56590605).

Almost surely, 2^113181209 is an apocalyptic number.

It is an amenable number.

113181209 is a deficient number, since it is larger than the sum of its proper divisors (1).

113181209 is an equidigital number, since it uses as much as digits as its factorization.

113181209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 113181209 is about 10638.6657528094. The cubic root of 113181209 is about 483.7171026822.

The spelling of 113181209 in words is "one hundred thirteen million, one hundred eighty-one thousand, two hundred nine".