245319118209 has 45 divisors (see below), whose sum is σ = 402888464209. Its totient is φ = 148648535640.

The previous prime is 245319118201. The next prime is 245319118211. The reversal of 245319118209 is 902811913542.

The square root of 245319118209 is 495297.

It is a perfect power (a square), and thus also a powerful number.

245319118209 is a `hidden beast` number, since 2 + 4 + 531 + 91 + 1 + 8 + 20 + 9 = 666.

It is not a de Polignac number, because 245319118209 - 2³ = 245319118201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245319118201) 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 44 ways as a sum of consecutive naturals, for example, 49031902 + ... + 49036904.

Almost surely, 2^245319118209 is an apocalyptic number.

245319118209 is the 495297-th square number.

245319118209 is the 247649-th centered octagonal number.

It is an amenable number.

245319118209 is a deficient number, since it is larger than the sum of its proper divisors (157569346000).

245319118209 is an frugal number, since it uses more digits than its factorization.

245319118209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10040 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 245319118209 in words is "two hundred forty-five billion, three hundred nineteen million, one hundred eighteen thousand, two hundred nine".