531643816 has 32 divisors (see below), whose sum is σ = 1102363200. Its totient is φ = 238343040.

The previous prime is 531643813. The next prime is 531643817. The reversal of 531643816 is 618346135.

It is not an unprimeable number, because it can be changed into a prime (531643813) 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, 34956 + ... + 47803.

It is an arithmetic number, because the mean of its divisors is an integer number (34448850).

Almost surely, 2^531643816 is an apocalyptic number.

It is an amenable number.

531643816 is an abundant number, since it is smaller than the sum of its proper divisors (570719384).

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

531643816 is a wasteful number, since it uses less digits than its factorization.

531643816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82849 (or 82845 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 531643816 is about 23057.4026290907. The cubic root of 531643816 is about 810.1030280978.

The spelling of 531643816 in words is "five hundred thirty-one million, six hundred forty-three thousand, eight hundred sixteen".