521019 has 16 divisors (see below), whose sum is σ = 806400. Its totient is φ = 331848.

The previous prime is 521009. The next prime is 521021. The reversal of 521019 is 910125.

It is not a de Polignac number, because 521019 - 2⁸ = 520763 is a prime.

It is a super-2 number, since 2×521019² = 542921596722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520992 and 521010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202 + ... + 1040.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2⁵²¹⁰¹⁹ is an apocalyptic number.

521019 is a deficient number, since it is larger than the sum of its proper divisors (285381).

521019 is a wasteful number, since it uses less digits than its factorization.

521019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 521019 is about 721.8164586652. The cubic root of 521019 is about 80.4670080718.

The spelling of 521019 in words is "five hundred twenty-one thousand, nineteen".