531816820 has 12 divisors (see below), whose sum is σ = 1116815364. Its totient is φ = 212726720.

The previous prime is 531816757. The next prime is 531816823. The reversal of 531816820 is 28618135.

It can be written as a sum of positive squares in 2 ways, for example, as 87534736 + 444282084 = 9356^2 + 21078^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531816823) 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 3 ways as a sum of consecutive naturals, for example, 13295401 + ... + 13295440.

It is an arithmetic number, because the mean of its divisors is an integer number (93067947).

Almost surely, 2^531816820 is an apocalyptic number.

It is an amenable number.

531816820 is an abundant number, since it is smaller than the sum of its proper divisors (584998544).

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

531816820 is a wasteful number, since it uses less digits than its factorization.

531816820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26590850 (or 26590848 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 531816820 is about 23061.1539173563. The cubic root of 531816820 is about 810.1908913504.

The spelling of 531816820 in words is "five hundred thirty-one million, eight hundred sixteen thousand, eight hundred twenty".