521587 has 4 divisors (see below), whose sum is σ = 569016. Its totient is φ = 474160.

The previous prime is 521581. The next prime is 521603. The reversal of 521587 is 785125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521587 - 2¹¹ = 519539 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (521581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23698 + ... + 23719.

It is an arithmetic number, because the mean of its divisors is an integer number (142254).

2⁵²¹⁵⁸⁷ is an apocalyptic number.

521587 is a deficient number, since it is larger than the sum of its proper divisors (47429).

521587 is a wasteful number, since it uses less digits than its factorization.

521587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47428.

The product of its digits is 2800, while the sum is 28.

The square root of 521587 is about 722.2098033120. The cubic root of 521587 is about 80.4962383953.

The spelling of 521587 in words is "five hundred twenty-one thousand, five hundred eighty-seven".