531481816 has 8 divisors (see below), whose sum is σ = 996528420. Its totient is φ = 265740904.

The previous prime is 531481793. The next prime is 531481831. The reversal of 531481816 is 618184135.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 33217606 + ... + 33217621.

Almost surely, 2^531481816 is an apocalyptic number.

It is an amenable number.

531481816 is a deficient number, since it is larger than the sum of its proper divisors (465046604).

531481816 is a wasteful number, since it uses less digits than its factorization.

531481816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66435233 (or 66435229 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 531481816 is about 23053.8893898622. The cubic root of 531481816 is about 810.0207361455.

The spelling of 531481816 in words is "five hundred thirty-one million, four hundred eighty-one thousand, eight hundred sixteen".