629995221 has 6 divisors (see below), whose sum is σ = 909993110. Its totient is φ = 419996808.

The previous prime is 629995211. The next prime is 629995229. The reversal of 629995221 is 122599926.

It can be written as a sum of positive squares in only one way, i.e., 629759025 + 236196 = 25095^2 + 486^2 .

It is not a de Polignac number, because 629995221 - 2¹¹ = 629993173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629995229) 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 in 5 ways as a sum of consecutive naturals, for example, 34999726 + ... + 34999743.

Almost surely, 2^629995221 is an apocalyptic number.

It is an amenable number.

629995221 is a deficient number, since it is larger than the sum of its proper divisors (279997889).

629995221 is a wasteful number, since it uses less digits than its factorization.

629995221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69999475 (or 69999472 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 629995221 is about 25099.7055958830. The cubic root of 629995221 is about 857.2597205779.

The spelling of 629995221 in words is "six hundred twenty-nine million, nine hundred ninety-five thousand, two hundred twenty-one".