412778209 has 2 divisors, whose sum is σ = 412778210. Its totient is φ = 412778208.

The previous prime is 412778183. The next prime is 412778221. The reversal of 412778209 is 902877214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411968209 + 810000 = 20297^2 + 900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-412778209 is a prime.

It is not a weakly prime, because it can be changed into another prime (412778279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206389104 + 206389105.

It is an arithmetic number, because the mean of its divisors is an integer number (206389105).

Almost surely, 2^412778209 is an apocalyptic number.

It is an amenable number.

412778209 is a deficient number, since it is larger than the sum of its proper divisors (1).

412778209 is an equidigital number, since it uses as much as digits as its factorization.

412778209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 412778209 is about 20316.9438892763. The cubic root of 412778209 is about 744.5700920408.

The spelling of 412778209 in words is "four hundred twelve million, seven hundred seventy-eight thousand, two hundred nine".