531224507431 has 4 divisors (see below), whose sum is σ = 538501555552. Its totient is φ = 523947459312.

The previous prime is 531224507393. The next prime is 531224507447. The reversal of 531224507431 is 134705422135.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531224507431 is a prime.

It is a super-2 number, since 2×531224507431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531224507831) 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, 3638523951 + ... + 3638524096.

It is an arithmetic number, because the mean of its divisors is an integer number (134625388888).

Almost surely, 2^531224507431 is an apocalyptic number.

531224507431 is a deficient number, since it is larger than the sum of its proper divisors (7277048121).

531224507431 is an equidigital number, since it uses as much as digits as its factorization.

531224507431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7277048120.

The product of its (nonzero) digits is 100800, while the sum is 37.

Adding to 531224507431 its reverse (134705422135), we get a palindrome (665929929566).

The spelling of 531224507431 in words is "five hundred thirty-one billion, two hundred twenty-four million, five hundred seven thousand, four hundred thirty-one".