531242123553 has 12 divisors (see below), whose sum is σ = 767949711360. Its totient is φ = 353884503096.

The previous prime is 531242123453. The next prime is 531242123561. The reversal of 531242123553 is 355321242135.

531242123553 is a `hidden beast` number, since 53 + 1 + 2 + 42 + 12 + 3 + 553 = 666.

It is not a de Polignac number, because 531242123553 - 2¹⁰ = 531242122529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (531242123453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23063901 + ... + 23086922.

It is an arithmetic number, because the mean of its divisors is an integer number (63995809280).

Almost surely, 2^531242123553 is an apocalyptic number.

It is an amenable number.

531242123553 is a deficient number, since it is larger than the sum of its proper divisors (236707587807).

531242123553 is a wasteful number, since it uses less digits than its factorization.

531242123553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46152108 (or 46152105 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

Adding to 531242123553 its reverse (355321242135), we get a palindrome (886563365688).

The spelling of 531242123553 in words is "five hundred thirty-one billion, two hundred forty-two million, one hundred twenty-three thousand, five hundred fifty-three".