113209 has 2 divisors, whose sum is σ = 113210. Its totient is φ = 113208.

The previous prime is 113189. The next prime is 113213. The reversal of 113209 is 902311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 5625 = 328^2 + 75^2 .

It is an emirp because it is prime and its reverse (902311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113209 - 2⁵ = 113177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113192 and 113201.

It is not a weakly prime, because it can be changed into another prime (113279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56604 + 56605.

It is an arithmetic number, because the mean of its divisors is an integer number (56605).

2¹¹³²⁰⁹ is an apocalyptic number.

It is an amenable number.

113209 is a deficient number, since it is larger than the sum of its proper divisors (1).

113209 is an equidigital number, since it uses as much as digits as its factorization.

113209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 113209 is about 336.4654514211. The cubic root of 113209 is about 48.3756690767.

The spelling of 113209 in words is "one hundred thirteen thousand, two hundred nine".