113121209 has 2 divisors, whose sum is σ = 113121210. Its totient is φ = 113121208.

The previous prime is 113121187. The next prime is 113121223. The reversal of 113121209 is 902121311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107226025 + 5895184 = 10355^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 113121209 - 2²⁰ = 112072633 is a prime.

It is not a weakly prime, because it can be changed into another prime (113121299) 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, 56560604 + 56560605.

It is an arithmetic number, because the mean of its divisors is an integer number (56560605).

Almost surely, 2^113121209 is an apocalyptic number.

It is an amenable number.

113121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

113121209 is an equidigital number, since it uses as much as digits as its factorization.

113121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 113121209 is about 10635.8454765007. The cubic root of 113121209 is about 483.6316109988.

It can be divided in two parts, 11312 and 1209, that added together give a palindrome (12521).

The spelling of 113121209 in words is "one hundred thirteen million, one hundred twenty-one thousand, two hundred nine".