1489720171 has 2 divisors, whose sum is σ = 1489720172. Its totient is φ = 1489720170.

The previous prime is 1489720163. The next prime is 1489720187. The reversal of 1489720171 is 1710279841.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1489720171 - 2³ = 1489720163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1489720121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744860085 + 744860086.

It is an arithmetic number, because the mean of its divisors is an integer number (744860086).

Almost surely, 2^1489720171 is an apocalyptic number.

1489720171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1489720171 is an equidigital number, since it uses as much as digits as its factorization.

1489720171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1489720171 is about 38596.8932817137. The cubic root of 1489720171 is about 1142.0932534063.

The spelling of 1489720171 in words is "one billion, four hundred eighty-nine million, seven hundred twenty thousand, one hundred seventy-one".