171309898817 has 16 divisors (see below), whose sum is σ = 175227542160. Its totient is φ = 167429203200.

The previous prime is 171309898789. The next prime is 171309898831. The reversal of 171309898817 is 718898903171.

It is a happy number.

It is a Cunningham number, because it is equal to 413896²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 171309898816 = 1^2 + 413896^2 .

It is a cyclic number.

It is not a de Polignac number, because 171309898817 - 2²⁶ = 171242789953 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 171309898817.

It is not an unprimeable number, because it can be changed into a prime (171309898847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23434559 + ... + 23441867.

It is an arithmetic number, because the mean of its divisors is an integer number (10951721385).

Almost surely, 2^171309898817 is an apocalyptic number.

It is an amenable number.

171309898817 is a deficient number, since it is larger than the sum of its proper divisors (3917643343).

171309898817 is a wasteful number, since it uses less digits than its factorization.

171309898817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764.

The product of its (nonzero) digits is 6096384, while the sum is 62.

The spelling of 171309898817 in words is "one hundred seventy-one billion, three hundred nine million, eight hundred ninety-eight thousand, eight hundred seventeen".