245215217 has 16 divisors (see below), whose sum is σ = 268349760. Its totient is φ = 222722112.

The previous prime is 245215211. The next prime is 245215231. The reversal of 245215217 is 712512542.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 245215217 - 2¹² = 245211121 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 245215217.

It is not an unprimeable number, because it can be changed into a prime (245215211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 240134 + ... + 241152.

It is an arithmetic number, because the mean of its divisors is an integer number (16771860).

Almost surely, 2^245215217 is an apocalyptic number.

It is an amenable number.

245215217 is a deficient number, since it is larger than the sum of its proper divisors (23134543).

245215217 is a wasteful number, since it uses less digits than its factorization.

245215217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312.

The product of its digits is 5600, while the sum is 29.

The square root of 245215217 is about 15659.3491882645. The cubic root of 245215217 is about 625.9156430747.

Adding to 245215217 its reverse (712512542), we get a palindrome (957727759).

The spelling of 245215217 in words is "two hundred forty-five million, two hundred fifteen thousand, two hundred seventeen".