531031120 has 40 divisors (see below), whose sum is σ = 1238373864. Its totient is φ = 211771392.

The previous prime is 531031063. The next prime is 531031129. The reversal of 531031120 is 21130135.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 531025936 = 72^2 + 23044^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 531031094 and 531031103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531031129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17112 + ... + 36808.

Almost surely, 2^531031120 is an apocalyptic number.

It is an amenable number.

531031120 is an abundant number, since it is smaller than the sum of its proper divisors (707342744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531031120 is a wasteful number, since it uses less digits than its factorization.

531031120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20047 (or 20041 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 531031120 is about 23044.1124801976. The cubic root of 531031120 is about 809.7917058273.

Adding to 531031120 its reverse (21130135), we get a palindrome (552161255).

The spelling of 531031120 in words is "five hundred thirty-one million, thirty-one thousand, one hundred twenty".