631743160215121 has 2 divisors, whose sum is σ = 631743160215122. Its totient is φ = 631743160215120.

The previous prime is 631743160215119. The next prime is 631743160215191. The reversal of 631743160215121 is 121512061347136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521107768006225 + 110635392208896 = 22827785^2 + 10518336^2 .

It is a cyclic number.

It is not a de Polignac number, because 631743160215121 - 2¹ = 631743160215119 is a prime.

Together with 631743160215119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (631743160215191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315871580107560 + 315871580107561.

It is an arithmetic number, because the mean of its divisors is an integer number (315871580107561).

Almost surely, 2^{631743160215121} is an apocalyptic number.

It is an amenable number.

631743160215121 is a deficient number, since it is larger than the sum of its proper divisors (1).

631743160215121 is an equidigital number, since it uses as much as digits as its factorization.

631743160215121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 631743160215121 in words is "six hundred thirty-one trillion, seven hundred forty-three billion, one hundred sixty million, two hundred fifteen thousand, one hundred twenty-one".