1225009 has 2 divisors, whose sum is σ = 1225010. Its totient is φ = 1225008.

The previous prime is 1224991. The next prime is 1225019. The reversal of 1225009 is 9005221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 409600 = 903^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225009 - 2¹⁵ = 1192241 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612504 + 612505.

It is an arithmetic number, because the mean of its divisors is an integer number (612505).

2^1225009 is an apocalyptic number.

It is an amenable number.

1225009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225009 is an equidigital number, since it uses as much as digits as its factorization.

1225009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1225009 is about 1106.8012468370. The cubic root of 1225009 is about 106.9990100936. Note that the first 3 decimals are identical.

It can be divided in two parts, 122500 and 9, that multiplied together give a square (1102500 = 1050²).

The spelling of 1225009 in words is "one million, two hundred twenty-five thousand, nine".