631550189 has 2 divisors, whose sum is σ = 631550190. Its totient is φ = 631550188.

The previous prime is 631550149. The next prime is 631550191. The reversal of 631550189 is 981055136.

631550189 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., 359860900 + 271689289 = 18970^2 + 16483^2 .

It is a cyclic number.

It is not a de Polignac number, because 631550189 - 2¹⁶ = 631484653 is a prime.

Together with 631550191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631550149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315775094 + 315775095.

It is an arithmetic number, because the mean of its divisors is an integer number (315775095).

Almost surely, 2^631550189 is an apocalyptic number.

It is an amenable number.

631550189 is a deficient number, since it is larger than the sum of its proper divisors (1).

631550189 is an equidigital number, since it uses as much as digits as its factorization.

631550189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 631550189 is about 25130.6623271254. The cubic root of 631550189 is about 857.9644434962.

The spelling of 631550189 in words is "six hundred thirty-one million, five hundred fifty thousand, one hundred eighty-nine".