631555216 has 20 divisors (see below), whose sum is σ = 1224028924. Its totient is φ = 315676800.

The previous prime is 631555213. The next prime is 631555237. The reversal of 631555216 is 612555136.

It can be written as a sum of positive squares in 2 ways, for example, as 424195216 + 207360000 = 20596^2 + 14400^2 .

It is not an unprimeable number, because it can be changed into a prime (631555213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89746 + ... + 96526.

Almost surely, 2^631555216 is an apocalyptic number.

It is an amenable number.

631555216 is a deficient number, since it is larger than the sum of its proper divisors (592473708).

631555216 is a wasteful number, since it uses less digits than its factorization.

631555216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610 (or 12604 counting only the distinct ones).

The product of its digits is 27000, while the sum is 34.

The square root of 631555216 is about 25130.7623441869. The cubic root of 631555216 is about 857.9667198927.

The spelling of 631555216 in words is "six hundred thirty-one million, five hundred fifty-five thousand, two hundred sixteen".