631702271209 has 9 divisors (see below), whose sum is σ = 649266964101. Its totient is φ = 614600624160.

The previous prime is 631702271191. The next prime is 631702271219. The reversal of 631702271209 is 902172207136.

The square root of 631702271209 is 794797.

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

It can be written as a sum of positive squares in 4 ways, for example, as 254495025625 + 377207245584 = 504475^2 + 614172^2 .

It is not a de Polignac number, because 631702271209 - 2²³ = 631693882601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631702271219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29396749 + ... + 29418229.

It is an arithmetic number, because the mean of its divisors is an integer number (72140773789).

Almost surely, 2^631702271209 is an apocalyptic number.

631702271209 is the 794797-th square number.

631702271209 is the 397399-th centered octagonal number.

It is an amenable number.

631702271209 is a deficient number, since it is larger than the sum of its proper divisors (17564692892).

631702271209 is an frugal number, since it uses more digits than its factorization.

631702271209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43036 (or 21518 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 631702271209 in words is "six hundred thirty-one billion, seven hundred two million, two hundred seventy-one thousand, two hundred nine".