245209172171 has 2 divisors, whose sum is σ = 245209172172. Its totient is φ = 245209172170.

The previous prime is 245209172161. The next prime is 245209172183. The reversal of 245209172171 is 171271902542.

245209172171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245209172171 is a prime.

It is not a weakly prime, because it can be changed into another prime (245209172111) 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 as a sum of consecutive naturals, namely, 122604586085 + 122604586086.

It is an arithmetic number, because the mean of its divisors is an integer number (122604586086).

Almost surely, 2^245209172171 is an apocalyptic number.

245209172171 is a deficient number, since it is larger than the sum of its proper divisors (1).

245209172171 is an equidigital number, since it uses as much as digits as its factorization.

245209172171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 245209172171 in words is "two hundred forty-five billion, two hundred nine million, one hundred seventy-two thousand, one hundred seventy-one".