531085836 has 24 divisors (see below), whose sum is σ = 1241060464. Its totient is φ = 176762880.

The previous prime is 531085829. The next prime is 531085837. The reversal of 531085836 is 638580135.

It is a junction number, because it is equal to n+sod(n) for n = 531085794 and 531085803.

It is not an unprimeable number, because it can be changed into a prime (531085837) 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 7 ways as a sum of consecutive naturals, for example, 24805 + ... + 40956.

Almost surely, 2^531085836 is an apocalyptic number.

It is an amenable number.

531085836 is an abundant number, since it is smaller than the sum of its proper divisors (709974628).

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

531085836 is a wasteful number, since it uses less digits than its factorization.

531085836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66441 (or 66439 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 531085836 is about 23045.2996509050. The cubic root of 531085836 is about 809.8195177826.

The spelling of 531085836 in words is "five hundred thirty-one million, eighty-five thousand, eight hundred thirty-six".