631864420201 has 9 divisors (see below), whose sum is σ = 735032430999. Its totient is φ = 541593305064.

The previous prime is 631864420199. The next prime is 631864420217. The reversal of 631864420201 is 102024468136.

The square root of 631864420201 is 794899.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 96444408025 + 535420012176 = 310555^2 + 731724^2 .

It is not a de Polignac number, because 631864420201 - 2¹ = 631864420199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631864420241) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5507515 + ... + 5621071.

It is an arithmetic number, because the mean of its divisors is an integer number (81670270111).

Almost surely, 2^631864420201 is an apocalyptic number.

631864420201 is the 794899-th square number.

631864420201 is the 397450-th centered octagonal number.

It is an amenable number.

631864420201 is a deficient number, since it is larger than the sum of its proper divisors (103168010798).

631864420201 is an frugal number, since it uses more digits than its factorization.

631864420201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227128 (or 113564 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

Adding to 631864420201 its reverse (102024468136), we get a palindrome (733888888337).

The spelling of 631864420201 in words is "six hundred thirty-one billion, eight hundred sixty-four million, four hundred twenty thousand, two hundred one".