531243052531 has 4 divisors (see below), whose sum is σ = 531524284200. Its totient is φ = 530961820864.

The previous prime is 531243052523. The next prime is 531243052583. The reversal of 531243052531 is 135250342135.

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 531243052531 - 2³ = 531243052523 is a prime.

It is a super-2 number, since 2×531243052531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531243052511) 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, 140613001 + ... + 140616778.

It is an arithmetic number, because the mean of its divisors is an integer number (132881071050).

Almost surely, 2^531243052531 is an apocalyptic number.

531243052531 is a deficient number, since it is larger than the sum of its proper divisors (281231669).

531243052531 is a wasteful number, since it uses less digits than its factorization.

531243052531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281231668.

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 531243052531 its reverse (135250342135), we get a palindrome (666493394666).

The spelling of 531243052531 in words is "five hundred thirty-one billion, two hundred forty-three million, fifty-two thousand, five hundred thirty-one".