245664109 has 2 divisors, whose sum is σ = 245664110. Its totient is φ = 245664108.

The previous prime is 245664079. The next prime is 245664113. The reversal of 245664109 is 901466542.

245664109 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., 190578025 + 55086084 = 13805^2 + 7422^2 .

It is a cyclic number.

It is not a de Polignac number, because 245664109 - 2¹¹ = 245662061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245664179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122832054 + 122832055.

It is an arithmetic number, because the mean of its divisors is an integer number (122832055).

Almost surely, 2^245664109 is an apocalyptic number.

It is an amenable number.

245664109 is a deficient number, since it is larger than the sum of its proper divisors (1).

245664109 is an equidigital number, since it uses as much as digits as its factorization.

245664109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 245664109 is about 15673.6756697336. The cubic root of 245664109 is about 626.2973448508.

The spelling of 245664109 in words is "two hundred forty-five million, six hundred sixty-four thousand, one hundred nine".