634228909 has 2 divisors, whose sum is σ = 634228910. Its totient is φ = 634228908.

The previous prime is 634228807. The next prime is 634228913. The reversal of 634228909 is 909822436.

634228909 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., 407636100 + 226592809 = 20190^2 + 15053^2 .

It is a cyclic number.

It is not a de Polignac number, because 634228909 - 2¹⁷ = 634097837 is a prime.

It is a super-2 number, since 2×634228909² = 804492618022660562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634228919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317114454 + 317114455.

It is an arithmetic number, because the mean of its divisors is an integer number (317114455).

Almost surely, 2^634228909 is an apocalyptic number.

It is an amenable number.

634228909 is a deficient number, since it is larger than the sum of its proper divisors (1).

634228909 is an equidigital number, since it uses as much as digits as its factorization.

634228909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 634228909 is about 25183.9017826865. The cubic root of 634228909 is about 859.1757511916.

The spelling of 634228909 in words is "six hundred thirty-four million, two hundred twenty-eight thousand, nine hundred nine".