171209713 has 2 divisors, whose sum is σ = 171209714. Its totient is φ = 171209712.

The previous prime is 171209711. The next prime is 171209743. The reversal of 171209713 is 317902171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93470224 + 77739489 = 9668^2 + 8817^2 .

It is a cyclic number.

It is not a de Polignac number, because 171209713 - 2¹ = 171209711 is a prime.

Together with 171209711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (171209711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85604856 + 85604857.

It is an arithmetic number, because the mean of its divisors is an integer number (85604857).

Almost surely, 2^171209713 is an apocalyptic number.

It is an amenable number.

171209713 is a deficient number, since it is larger than the sum of its proper divisors (1).

171209713 is an equidigital number, since it uses as much as digits as its factorization.

171209713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 31.

The square root of 171209713 is about 13084.7129506153. The cubic root of 171209713 is about 555.2767204856.

The spelling of 171209713 in words is "one hundred seventy-one million, two hundred nine thousand, seven hundred thirteen".