531731838 has 40 divisors (see below), whose sum is σ = 1169996040. Its totient is φ = 161104240.

The previous prime is 531731819. The next prime is 531731843. The reversal of 531731838 is 838137135.

It is a junction number, because it is equal to n+sod(n) for n = 531731796 and 531731805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84820 + ... + 90872.

It is an arithmetic number, because the mean of its divisors is an integer number (29249901).

Almost surely, 2^531731838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531731838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584998020).

531731838 is an abundant number, since it is smaller than the sum of its proper divisors (638264202).

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

531731838 is an equidigital number, since it uses as much as digits as its factorization.

531731838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6102 (or 6069 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 531731838 is about 23059.3113080161. The cubic root of 531731838 is about 810.1477340655.

The spelling of 531731838 in words is "five hundred thirty-one million, seven hundred thirty-one thousand, eight hundred thirty-eight".