171217245079 has 2 divisors, whose sum is σ = 171217245080. Its totient is φ = 171217245078.

The previous prime is 171217245077. The next prime is 171217245187. The reversal of 171217245079 is 970542712171.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171217245079 - 2¹ = 171217245077 is a prime.

Together with 171217245077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171217245077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85608622539 + 85608622540.

It is an arithmetic number, because the mean of its divisors is an integer number (85608622540).

Almost surely, 2^171217245079 is an apocalyptic number.

171217245079 is a deficient number, since it is larger than the sum of its proper divisors (1).

171217245079 is an equidigital number, since it uses as much as digits as its factorization.

171217245079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 46.

The spelling of 171217245079 in words is "one hundred seventy-one billion, two hundred seventeen million, two hundred forty-five thousand, seventy-nine".