631605229 has 2 divisors, whose sum is σ = 631605230. Its totient is φ = 631605228.

The previous prime is 631605211. The next prime is 631605257. The reversal of 631605229 is 922506136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603832329 + 27772900 = 24573^2 + 5270^2 .

It is a cyclic number.

It is not a de Polignac number, because 631605229 - 2⁵ = 631605197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631605194 and 631605203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631603229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315802614 + 315802615.

It is an arithmetic number, because the mean of its divisors is an integer number (315802615).

Almost surely, 2^631605229 is an apocalyptic number.

It is an amenable number.

631605229 is a deficient number, since it is larger than the sum of its proper divisors (1).

631605229 is an equidigital number, since it uses as much as digits as its factorization.

631605229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 631605229 is about 25131.7573798571. The cubic root of 631605229 is about 857.9893668209.

The spelling of 631605229 in words is "six hundred thirty-one million, six hundred five thousand, two hundred twenty-nine".