245849509 has 2 divisors, whose sum is σ = 245849510. Its totient is φ = 245849508.

The previous prime is 245849503. The next prime is 245849557. The reversal of 245849509 is 905948542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146289025 + 99560484 = 12095^2 + 9978^2 .

It is a cyclic number.

It is not a de Polignac number, because 245849509 - 2⁷ = 245849381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245849503) 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, 122924754 + 122924755.

It is an arithmetic number, because the mean of its divisors is an integer number (122924755).

Almost surely, 2^245849509 is an apocalyptic number.

It is an amenable number.

245849509 is a deficient number, since it is larger than the sum of its proper divisors (1).

245849509 is an equidigital number, since it uses as much as digits as its factorization.

245849509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 245849509 is about 15679.5889295606. The cubic root of 245849509 is about 626.4548584712.

The spelling of 245849509 in words is "two hundred forty-five million, eight hundred forty-nine thousand, five hundred nine".