209724320245 has 24 divisors (see below), whose sum is σ = 280756943712. Its totient is φ = 150250230240.

The previous prime is 209724320167. The next prime is 209724320269. The reversal of 209724320245 is 542023427902.

209724320245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209724320245 - 2¹⁵ = 209724287477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209724320198 and 209724320207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2546419 + ... + 2627488.

It is an arithmetic number, because the mean of its divisors is an integer number (11698205988).

Almost surely, 2^209724320245 is an apocalyptic number.

It is an amenable number.

209724320245 is a deficient number, since it is larger than the sum of its proper divisors (71032623467).

209724320245 is a wasteful number, since it uses less digits than its factorization.

209724320245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174001 (or 5173990 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

It can be divided in two parts, 2097 and 24320245, that added together give a palindrome (24322342).

The spelling of 209724320245 in words is "two hundred nine billion, seven hundred twenty-four million, three hundred twenty thousand, two hundred forty-five".