531021243 has 4 divisors (see below), whose sum is σ = 708028328. Its totient is φ = 354014160.

The previous prime is 531021223. The next prime is 531021269. The reversal of 531021243 is 342120135.

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

It is not a de Polignac number, because 531021243 - 2¹⁰ = 531020219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531021223) 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, 88503538 + ... + 88503543.

It is an arithmetic number, because the mean of its divisors is an integer number (177007082).

Almost surely, 2^531021243 is an apocalyptic number.

531021243 is a deficient number, since it is larger than the sum of its proper divisors (177007085).

531021243 is a wasteful number, since it uses less digits than its factorization.

531021243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177007084.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 531021243 is about 23043.8981728353. The cubic root of 531021243 is about 809.7866851785.

Adding to 531021243 its reverse (342120135), we get a palindrome (873141378).

It can be divided in two parts, 53102 and 1243, that added together give a palindrome (54345).

The spelling of 531021243 in words is "five hundred thirty-one million, twenty-one thousand, two hundred forty-three".