531505124423 has 32 divisors (see below), whose sum is σ = 729094947840. Its totient is φ = 374963074560.

The previous prime is 531505124417. The next prime is 531505124441. The reversal of 531505124423 is 324421505135.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531505124423 is a prime.

It is a super-2 number, since 2×531505124423² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531505124413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9011963 + ... + 9070748.

It is an arithmetic number, because the mean of its divisors is an integer number (22784217120).

Almost surely, 2^531505124423 is an apocalyptic number.

531505124423 is a deficient number, since it is larger than the sum of its proper divisors (197589823417).

531505124423 is a wasteful number, since it uses less digits than its factorization.

531505124423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18082767.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 531505124423 its reverse (324421505135), we get a palindrome (855926629558).

The spelling of 531505124423 in words is "five hundred thirty-one billion, five hundred five million, one hundred twenty-four thousand, four hundred twenty-three".