521873 has 12 divisors (see below), whose sum is σ = 606480. Its totient is φ = 447480.

The previous prime is 521869. The next prime is 521879. The reversal of 521873 is 378125.

It is not a de Polignac number, because 521873 - 2² = 521869 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2186 + ... + 2412.

It is an arithmetic number, because the mean of its divisors is an integer number (50540).

2⁵²¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

521873 is a deficient number, since it is larger than the sum of its proper divisors (84607).

521873 is a wasteful number, since it uses less digits than its factorization.

521873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 257 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 521873 is about 722.4077795816. The cubic root of 521873 is about 80.5109484485.

Adding to 521873 its reverse (378125), we get a palindrome (899998).

The spelling of 521873 in words is "five hundred twenty-one thousand, eight hundred seventy-three".