531165231220 has 48 divisors (see below), whose sum is σ = 1233716854608. Its totient is φ = 190821934080.

The previous prime is 531165231203. The next prime is 531165231221. The reversal of 531165231220 is 22132561135.

It can be written as a sum of positive squares in 8 ways, for example, as 17081967204 + 514083264016 = 130698^2 + 716996^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531165231221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27597721 + ... + 27616960.

It is an arithmetic number, because the mean of its divisors is an integer number (25702434471).

Almost surely, 2^531165231220 is an apocalyptic number.

It is an amenable number.

531165231220 is an abundant number, since it is smaller than the sum of its proper divisors (702551623388).

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

531165231220 is a wasteful number, since it uses less digits than its factorization.

531165231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55214740 (or 55214738 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 531165231220 its reverse (22132561135), we get a palindrome (553297792355).

The spelling of 531165231220 in words is "five hundred thirty-one billion, one hundred sixty-five million, two hundred thirty-one thousand, two hundred twenty".