1720171 has 2 divisors, whose sum is σ = 1720172. Its totient is φ = 1720170.

The previous prime is 1720163. The next prime is 1720177. The reversal of 1720171 is 1710271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1720171 - 2³ = 1720163 is a prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (1720177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860085 + 860086.

It is an arithmetic number, because the mean of its divisors is an integer number (860086).

2^1720171 is an apocalyptic number.

1720171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720171 is an equidigital number, since it uses as much as digits as its factorization.

1720171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 1720171 is about 1311.5528963789. The cubic root of 1720171 is about 119.8184987641.

It can be divided in two parts, 1720 and 171, that added together give a triangular number (1891 = T₆₁).

The spelling of 1720171 in words is "one million, seven hundred twenty thousand, one hundred seventy-one".