521000671 has 2 divisors, whose sum is σ = 521000672. Its totient is φ = 521000670.

The previous prime is 521000657. The next prime is 521000681. The reversal of 521000671 is 176000125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521000671 - 2¹⁷ = 520869599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521000681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260500335 + 260500336.

It is an arithmetic number, because the mean of its divisors is an integer number (260500336).

Almost surely, 2^521000671 is an apocalyptic number.

521000671 is a deficient number, since it is larger than the sum of its proper divisors (1).

521000671 is an equidigital number, since it uses as much as digits as its factorization.

521000671 is an evil number, because the sum of its binary digits is even.

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

The square root of 521000671 is about 22825.4391195438. The cubic root of 521000671 is about 804.6606447400.

Adding to 521000671 its reverse (176000125), we get a palindrome (697000796).

The spelling of 521000671 in words is "five hundred twenty-one million, six hundred seventy-one", and thus it is an aban number.