521919 has 6 divisors (see below), whose sum is σ = 753896. Its totient is φ = 347940.

The previous prime is 521903. The next prime is 521923. The reversal of 521919 is 919125.

It is a happy number.

It is not a de Polignac number, because 521919 - 2⁴ = 521903 is a prime.

It is a super-3 number, since 3×521919³ = 426511333985983677, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 521892 and 521901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28987 + ... + 29004.

2⁵²¹⁹¹⁹ is an apocalyptic number.

521919 is a deficient number, since it is larger than the sum of its proper divisors (231977).

521919 is a wasteful number, since it uses less digits than its factorization.

521919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57997 (or 57994 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 521919 is about 722.4396168539. The cubic root of 521919 is about 80.5133138994.

Adding to 521919 its product of digits (810), we get a square (522729 = 723²).

The spelling of 521919 in words is "five hundred twenty-one thousand, nine hundred nineteen".