245581109 has 2 divisors, whose sum is σ = 245581110. Its totient is φ = 245581108.

The previous prime is 245581093. The next prime is 245581111. The reversal of 245581109 is 901185542.

245581109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242674084 + 2907025 = 15578^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 245581109 - 2⁴ = 245581093 is a prime.

It is a Sophie Germain prime.

Together with 245581111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245581139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122790554 + 122790555.

It is an arithmetic number, because the mean of its divisors is an integer number (122790555).

Almost surely, 2^245581109 is an apocalyptic number.

It is an amenable number.

245581109 is a deficient number, since it is larger than the sum of its proper divisors (1).

245581109 is an equidigital number, since it uses as much as digits as its factorization.

245581109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 245581109 is about 15671.0276944430. The cubic root of 245581109 is about 626.2268033634.

The spelling of 245581109 in words is "two hundred forty-five million, five hundred eighty-one thousand, one hundred nine".