245489309 has 4 divisors (see below), whose sum is σ = 264373116. Its totient is φ = 226605504.

The previous prime is 245489267. The next prime is 245489359. The reversal of 245489309 is 903984542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10725625 + 234763684 = 3275^2 + 15322^2 .

It is a cyclic number.

It is not a de Polignac number, because 245489309 - 2¹² = 245485213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245489309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245489359) 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 in 3 ways as a sum of consecutive naturals, for example, 9441884 + ... + 9441909.

It is an arithmetic number, because the mean of its divisors is an integer number (66093279).

Almost surely, 2^245489309 is an apocalyptic number.

It is an amenable number.

245489309 is a deficient number, since it is larger than the sum of its proper divisors (18883807).

245489309 is a wasteful number, since it uses less digits than its factorization.

245489309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18883806.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 245489309 is about 15668.0984487589. The cubic root of 245489309 is about 626.1487642648.

The spelling of 245489309 in words is "two hundred forty-five million, four hundred eighty-nine thousand, three hundred nine".