245043709 has 2 divisors, whose sum is σ = 245043710. Its totient is φ = 245043708.

The previous prime is 245043691. The next prime is 245043749. The reversal of 245043709 is 907340542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166668100 + 78375609 = 12910^2 + 8853^2 .

It is a cyclic number.

It is not a de Polignac number, because 245043709 - 2⁷ = 245043581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245043749) 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, 122521854 + 122521855.

It is an arithmetic number, because the mean of its divisors is an integer number (122521855).

Almost surely, 2^245043709 is an apocalyptic number.

It is an amenable number.

245043709 is a deficient number, since it is larger than the sum of its proper divisors (1).

245043709 is an equidigital number, since it uses as much as digits as its factorization.

245043709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 245043709 is about 15653.8720130197. The cubic root of 245043709 is about 625.7696834308.

The spelling of 245043709 in words is "two hundred forty-five million, forty-three thousand, seven hundred nine".