647404229 has 2 divisors, whose sum is σ = 647404230. Its totient is φ = 647404228.

The previous prime is 647404213. The next prime is 647404267. The reversal of 647404229 is 922404746.

647404229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (647404267) can be obtained adding 647404229 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628655329 + 18748900 = 25073^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 647404229 - 2⁴ = 647404213 is a prime.

It is a Chen prime.

It is equal to p_33665447 and since 647404229 and 33665447 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 647404192 and 647404201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647404129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323702114 + 323702115.

It is an arithmetic number, because the mean of its divisors is an integer number (323702115).

Almost surely, 2^647404229 is an apocalyptic number.

It is an amenable number.

647404229 is a deficient number, since it is larger than the sum of its proper divisors (1).

647404229 is an equidigital number, since it uses as much as digits as its factorization.

647404229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 647404229 is about 25444.1393841490. The cubic root of 647404229 is about 865.0844601058.

The spelling of 647404229 in words is "six hundred forty-seven million, four hundred four thousand, two hundred twenty-nine".