531223140 has 192 divisors, whose sum is σ = 1839366144. Its totient is φ = 111777792.

The previous prime is 531223103. The next prime is 531223141. The reversal of 531223140 is 41322135.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (531223141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 334789 + ... + 336371.

It is an arithmetic number, because the mean of its divisors is an integer number (9580032).

Almost surely, 2^531223140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531223140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919683072).

531223140 is an abundant number, since it is smaller than the sum of its proper divisors (1308143004).

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

531223140 is a wasteful number, since it uses less digits than its factorization.

531223140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 531223140 is about 23048.2784606573. The cubic root of 531223140 is about 809.8893005249.

Adding to 531223140 its reverse (41322135), we get a palindrome (572545275).

The spelling of 531223140 in words is "five hundred thirty-one million, two hundred twenty-three thousand, one hundred forty".