671287 has 2 divisors, whose sum is σ = 671288. Its totient is φ = 671286.

The previous prime is 671269. The next prime is 671299. The reversal of 671287 is 782176.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671287 - 2⁷ = 671159 is a prime.

671287 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671287.

It is not a weakly prime, because it can be changed into another prime (671257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335643 + 335644.

It is an arithmetic number, because the mean of its divisors is an integer number (335644).

2⁶⁷¹²⁸⁷ is an apocalyptic number.

671287 is a deficient number, since it is larger than the sum of its proper divisors (1).

671287 is an equidigital number, since it uses as much as digits as its factorization.

671287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 671287 is about 819.3210603909. The cubic root of 671287 is about 87.5593936889.

Subtracting 671287 from its reverse (782176), we obtain a square (110889 = 333²).

The spelling of 671287 in words is "six hundred seventy-one thousand, two hundred eighty-seven".