531311020 has 48 divisors (see below), whose sum is σ = 1127887488. Its totient is φ = 210228480.

The previous prime is 531310999. The next prime is 531311023. The reversal of 531311020 is 20113135.

It is a junction number, because it is equal to n+sod(n) for n = 531310985 and 531311003.

It is not an unprimeable number, because it can be changed into a prime (531311023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1147309 + ... + 1147771.

It is an arithmetic number, because the mean of its divisors is an integer number (23497656).

Almost surely, 2^531311020 is an apocalyptic number.

It is an amenable number.

531311020 is an abundant number, since it is smaller than the sum of its proper divisors (596576468).

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

531311020 is a wasteful number, since it uses less digits than its factorization.

531311020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 968 counting only the distinct ones).

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

The square root of 531311020 is about 23050.1848148773. The cubic root of 531311020 is about 809.9339579341.

Adding to 531311020 its reverse (20113135), we get a palindrome (551424155).

The spelling of 531311020 in words is "five hundred thirty-one million, three hundred eleven thousand, twenty".