1687171 has 2 divisors, whose sum is σ = 1687172. Its totient is φ = 1687170.

The previous prime is 1687157. The next prime is 1687177. The reversal of 1687171 is 1717861.

It is a strong prime.

It is an emirp because it is prime and its reverse (1717861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687171 - 2⁵ = 1687139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1687177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843585 + 843586.

It is an arithmetic number, because the mean of its divisors is an integer number (843586).

2^1687171 is an apocalyptic number.

1687171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687171 is an equidigital number, since it uses as much as digits as its factorization.

1687171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 31.

The square root of 1687171 is about 1298.9114673449. The cubic root of 1687171 is about 119.0473412844.

The spelling of 1687171 in words is "one million, six hundred eighty-seven thousand, one hundred seventy-one".