536243221 has 4 divisors (see below), whose sum is σ = 537482092. Its totient is φ = 535004352.

The previous prime is 536243171. The next prime is 536243237. The reversal of 536243221 is 122342635.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150552900 + 385690321 = 12270^2 + 19639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-536243221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 536243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (536243261) 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, 618786 + ... + 619651.

It is an arithmetic number, because the mean of its divisors is an integer number (134370523).

Almost surely, 2^536243221 is an apocalyptic number.

It is an amenable number.

536243221 is a deficient number, since it is larger than the sum of its proper divisors (1238871).

536243221 is a wasteful number, since it uses less digits than its factorization.

536243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238870.

The product of its digits is 8640, while the sum is 28.

The square root of 536243221 is about 23156.9259833856. The cubic root of 536243221 is about 812.4324688962.

Adding to 536243221 its reverse (122342635), we get a palindrome (658585856).

The spelling of 536243221 in words is "five hundred thirty-six million, two hundred forty-three thousand, two hundred twenty-one".