245021617 has 8 divisors (see below), whose sum is σ = 251433000. Its totient is φ = 238631040.

The previous prime is 245021593. The next prime is 245021627. The reversal of 245021617 is 716120542.

It can be written as a sum of positive squares in 4 ways, for example, as 46662561 + 198359056 = 6831^2 + 14084^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245021617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245021627) 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, 20259 + ... + 30007.

It is an arithmetic number, because the mean of its divisors is an integer number (31429125).

Almost surely, 2^245021617 is an apocalyptic number.

It is an amenable number.

245021617 is a deficient number, since it is larger than the sum of its proper divisors (6411383).

245021617 is an equidigital number, since it uses as much as digits as its factorization.

245021617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10403.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 245021617 is about 15653.1663570027. The cubic root of 245021617 is about 625.7508773718.

The spelling of 245021617 in words is "two hundred forty-five million, twenty-one thousand, six hundred seventeen".