631672121 has 2 divisors, whose sum is σ = 631672122. Its totient is φ = 631672120.

The previous prime is 631672061. The next prime is 631672123. The reversal of 631672121 is 121276136.

631672121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631014400 + 657721 = 25120^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 631672121 - 2²⁶ = 564563257 is a prime.

Together with 631672123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631672123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315836060 + 315836061.

It is an arithmetic number, because the mean of its divisors is an integer number (315836061).

Almost surely, 2^631672121 is an apocalyptic number.

It is an amenable number.

631672121 is a deficient number, since it is larger than the sum of its proper divisors (1).

631672121 is an equidigital number, since it uses as much as digits as its factorization.

631672121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 631672121 is about 25133.0881707760. The cubic root of 631672121 is about 858.0196550432.

The spelling of 631672121 in words is "six hundred thirty-one million, six hundred seventy-two thousand, one hundred twenty-one".