521819 has 2 divisors, whose sum is σ = 521820. Its totient is φ = 521818.

The previous prime is 521813. The next prime is 521831. The reversal of 521819 is 918125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521819 - 2¹⁶ = 456283 is a prime.

It is a super-2 number, since 2×521819² = 544590137522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260909 + 260910.

It is an arithmetic number, because the mean of its divisors is an integer number (260910).

2⁵²¹⁸¹⁹ is an apocalyptic number.

521819 is a deficient number, since it is larger than the sum of its proper divisors (1).

521819 is an equidigital number, since it uses as much as digits as its factorization.

521819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 521819 is about 722.3704036019. The cubic root of 521819 is about 80.5081714375.

The spelling of 521819 in words is "five hundred twenty-one thousand, eight hundred nineteen".