245913209 has 2 divisors, whose sum is σ = 245913210. Its totient is φ = 245913208.

The previous prime is 245913197. The next prime is 245913229. The reversal of 245913209 is 902319542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200647225 + 45265984 = 14165^2 + 6728^2 .

It is a cyclic number.

It is not a de Polignac number, because 245913209 - 2¹² = 245909113 is a prime.

It is not a weakly prime, because it can be changed into another prime (245913229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122956604 + 122956605.

It is an arithmetic number, because the mean of its divisors is an integer number (122956605).

Almost surely, 2^245913209 is an apocalyptic number.

It is an amenable number.

245913209 is a deficient number, since it is larger than the sum of its proper divisors (1).

245913209 is an equidigital number, since it uses as much as digits as its factorization.

245913209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 245913209 is about 15681.6201012523. The cubic root of 245913209 is about 626.5089589500.

The spelling of 245913209 in words is "two hundred forty-five million, nine hundred thirteen thousand, two hundred nine".