245263217 has 8 divisors (see below), whose sum is σ = 246720936. Its totient is φ = 243810432.

The previous prime is 245263211. The next prime is 245263231. The reversal of 245263217 is 712362542.

It can be written as a sum of positive squares in 4 ways, for example, as 16679056 + 228584161 = 4084^2 + 15119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245263217 - 2¹² = 245259121 is a prime.

It is a super-2 number, since 2×245263217² = 120308091226378178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245263211) 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 7 ways as a sum of consecutive naturals, for example, 144023 + ... + 145715.

It is an arithmetic number, because the mean of its divisors is an integer number (30840117).

Almost surely, 2^245263217 is an apocalyptic number.

It is an amenable number.

245263217 is a deficient number, since it is larger than the sum of its proper divisors (1457719).

245263217 is a wasteful number, since it uses less digits than its factorization.

245263217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467.

The product of its digits is 20160, while the sum is 32.

The square root of 245263217 is about 15660.8817440143. The cubic root of 245263217 is about 625.9564806582.

The spelling of 245263217 in words is "two hundred forty-five million, two hundred sixty-three thousand, two hundred seventeen".