213587 has 4 divisors (see below), whose sum is σ = 233016. Its totient is φ = 194160.

The previous prime is 213557. The next prime is 213589. The reversal of 213587 is 785312.

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 213587 - 2⁶ = 213523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213589) 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, 9698 + ... + 9719.

It is an arithmetic number, because the mean of its divisors is an integer number (58254).

2²¹³⁵⁸⁷ is an apocalyptic number.

213587 is a deficient number, since it is larger than the sum of its proper divisors (19429).

213587 is a wasteful number, since it uses less digits than its factorization.

213587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19428.

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

The square root of 213587 is about 462.1547359922. The cubic root of 213587 is about 59.7757368860.

Adding to 213587 its reverse (785312), we get a palindrome (998899).

It can be divided in two parts, 2135 and 87, that multiplied together give a triangular number (185745 = T₆₀₉).

The spelling of 213587 in words is "two hundred thirteen thousand, five hundred eighty-seven".