629538809 has 2 divisors, whose sum is σ = 629538810. Its totient is φ = 629538808.

The previous prime is 629538797. The next prime is 629538829. The reversal of 629538809 is 908835926.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603783184 + 25755625 = 24572^2 + 5075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-629538809 is a prime.

It is a super-2 number, since 2×629538809² = 792638224074276962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (629538829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314769404 + 314769405.

It is an arithmetic number, because the mean of its divisors is an integer number (314769405).

Almost surely, 2^629538809 is an apocalyptic number.

It is an amenable number.

629538809 is a deficient number, since it is larger than the sum of its proper divisors (1).

629538809 is an equidigital number, since it uses as much as digits as its factorization.

629538809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 629538809 is about 25090.6119694200. The cubic root of 629538809 is about 857.0526512041.

The spelling of 629538809 in words is "six hundred twenty-nine million, five hundred thirty-eight thousand, eight hundred nine".