520649 has 2 divisors, whose sum is σ = 520650. Its totient is φ = 520648.

The previous prime is 520633. The next prime is 520679. The reversal of 520649 is 946025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322624 + 198025 = 568^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 520649 - 2⁴ = 520633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260324 + 260325.

It is an arithmetic number, because the mean of its divisors is an integer number (260325).

2⁵²⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

520649 is a deficient number, since it is larger than the sum of its proper divisors (1).

520649 is an equidigital number, since it uses as much as digits as its factorization.

520649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 520649 is about 721.5601153057. The cubic root of 520649 is about 80.4479557637.

The spelling of 520649 in words is "five hundred twenty thousand, six hundred forty-nine".