521671 has 2 divisors, whose sum is σ = 521672. Its totient is φ = 521670.

The previous prime is 521669. The next prime is 521693. The reversal of 521671 is 176125.

It is an a-pointer prime, because the next prime (521693) can be obtained adding 521671 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521671 - 2¹ = 521669 is a prime.

Together with 521669, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260835 + 260836.

It is an arithmetic number, because the mean of its divisors is an integer number (260836).

2⁵²¹⁶⁷¹ is an apocalyptic number.

521671 is a deficient number, since it is larger than the sum of its proper divisors (1).

521671 is an equidigital number, since it uses as much as digits as its factorization.

521671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 521671 is about 722.2679558170. The cubic root of 521671 is about 80.5005593881.

Adding to 521671 its reverse (176125), we get a palindrome (697796).

The spelling of 521671 in words is "five hundred twenty-one thousand, six hundred seventy-one".