531011823 has 16 divisors (see below), whose sum is σ = 722497536. Its totient is φ = 346788000.

The previous prime is 531011821. The next prime is 531011857. The reversal of 531011823 is 328110135.

It is not a de Polignac number, because 531011823 - 2¹ = 531011821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531011793 and 531011802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531011821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117186 + ... + 121632.

It is an arithmetic number, because the mean of its divisors is an integer number (45156096).

Almost surely, 2^531011823 is an apocalyptic number.

531011823 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

531011823 is a deficient number, since it is larger than the sum of its proper divisors (191485713).

531011823 is a wasteful number, since it uses less digits than its factorization.

531011823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 531011823 is about 23043.6937794269. The cubic root of 531011823 is about 809.7818967727.

Adding to 531011823 its reverse (328110135), we get a palindrome (859121958).

The spelling of 531011823 in words is "five hundred thirty-one million, eleven thousand, eight hundred twenty-three".