531313243 has 4 divisors (see below), whose sum is σ = 536471728. Its totient is φ = 526154760.

The previous prime is 531313241. The next prime is 531313253. The reversal of 531313243 is 342313135.

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 531313243 - 2¹ = 531313241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531313241) 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, 2579088 + ... + 2579293.

It is an arithmetic number, because the mean of its divisors is an integer number (134117932).

Almost surely, 2^531313243 is an apocalyptic number.

531313243 is a deficient number, since it is larger than the sum of its proper divisors (5158485).

531313243 is a wasteful number, since it uses less digits than its factorization.

531313243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158484.

The product of its digits is 3240, while the sum is 25.

The square root of 531313243 is about 23050.2330356984. The cubic root of 531313243 is about 809.9350875177.

Adding to 531313243 its reverse (342313135), we get a palindrome (873626378).

The spelling of 531313243 in words is "five hundred thirty-one million, three hundred thirteen thousand, two hundred forty-three".