631541620 has 12 divisors (see below), whose sum is σ = 1326237444. Its totient is φ = 252616640.

The previous prime is 631541609. The next prime is 631541621. The reversal of 631541620 is 26145136.

631541620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 411197284 + 220344336 = 20278^2 + 14844^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631541621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15788521 + ... + 15788560.

It is an arithmetic number, because the mean of its divisors is an integer number (110519787).

Almost surely, 2^631541620 is an apocalyptic number.

It is an amenable number.

631541620 is an abundant number, since it is smaller than the sum of its proper divisors (694695824).

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

631541620 is a wasteful number, since it uses less digits than its factorization.

631541620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31577090 (or 31577088 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 631541620 is about 25130.4918376064. The cubic root of 631541620 is about 857.9605631339.

Adding to 631541620 its reverse (26145136), we get a palindrome (657686756).

The spelling of 631541620 in words is "six hundred thirty-one million, five hundred forty-one thousand, six hundred twenty".