171917489 has 2 divisors, whose sum is σ = 171917490. Its totient is φ = 171917488.

The previous prime is 171917477. The next prime is 171917497. The reversal of 171917489 is 984719171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158558464 + 13359025 = 12592^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 171917489 - 2²⁰ = 170868913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171917989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85958744 + 85958745.

It is an arithmetic number, because the mean of its divisors is an integer number (85958745).

Almost surely, 2^171917489 is an apocalyptic number.

It is an amenable number.

171917489 is a deficient number, since it is larger than the sum of its proper divisors (1).

171917489 is an equidigital number, since it uses as much as digits as its factorization.

171917489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 47.

The square root of 171917489 is about 13111.7309688691. The cubic root of 171917489 is about 556.0408344748.

The spelling of 171917489 in words is "one hundred seventy-one million, nine hundred seventeen thousand, four hundred eighty-nine".