531123420 has 24 divisors (see below), whose sum is σ = 1487145744. Its totient is φ = 141632896.

The previous prime is 531123413. The next prime is 531123421. The reversal of 531123420 is 24321135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531123421) 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, 4425969 + ... + 4426088.

It is an arithmetic number, because the mean of its divisors is an integer number (61964406).

Almost surely, 2^531123420 is an apocalyptic number.

It is an amenable number.

531123420 is an abundant number, since it is smaller than the sum of its proper divisors (956022324).

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

531123420 is a wasteful number, since it uses less digits than its factorization.

531123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852069 (or 8852067 counting only the distinct ones).

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

The square root of 531123420 is about 23046.1150739121. The cubic root of 531123420 is about 809.8386204943.

Adding to 531123420 its reverse (24321135), we get a palindrome (555444555).

The spelling of 531123420 in words is "five hundred thirty-one million, one hundred twenty-three thousand, four hundred twenty".