629543221 has 2 divisors, whose sum is σ = 629543222. Its totient is φ = 629543220.

The previous prime is 629543209. The next prime is 629543237. The reversal of 629543221 is 122345926.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401200900 + 228342321 = 20030^2 + 15111^2 .

It is a cyclic number.

It is not a de Polignac number, because 629543221 - 2⁹ = 629542709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629543821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314771610 + 314771611.

It is an arithmetic number, because the mean of its divisors is an integer number (314771611).

Almost surely, 2^629543221 is an apocalyptic number.

It is an amenable number.

629543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

629543221 is an equidigital number, since it uses as much as digits as its factorization.

629543221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 629543221 is about 25090.6998905969. The cubic root of 629543221 is about 857.0546533616.

The spelling of 629543221 in words is "six hundred twenty-nine million, five hundred forty-three thousand, two hundred twenty-one".