109209208249 has 2 divisors, whose sum is σ = 109209208250. Its totient is φ = 109209208248.

The previous prime is 109209208153. The next prime is 109209208267. The reversal of 109209208249 is 942802902901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97761278224 + 11447930025 = 312668^2 + 106995^2 .

It is a cyclic number.

It is not a de Polignac number, because 109209208249 - 2¹⁷ = 109209077177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 109209208199 and 109209208208.

It is not a weakly prime, because it can be changed into another prime (109209208279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54604604124 + 54604604125.

It is an arithmetic number, because the mean of its divisors is an integer number (54604604125).

Almost surely, 2^109209208249 is an apocalyptic number.

It is an amenable number.

109209208249 is a deficient number, since it is larger than the sum of its proper divisors (1).

109209208249 is an equidigital number, since it uses as much as digits as its factorization.

109209208249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 109209208249 in words is "one hundred nine billion, two hundred nine million, two hundred eight thousand, two hundred forty-nine".