1247009 has 2 divisors, whose sum is σ = 1247010. Its totient is φ = 1247008.

The previous prime is 1246997. The next prime is 1247017. The reversal of 1247009 is 9007421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 247009 = 1000^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247009 - 2¹⁶ = 1181473 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623504 + 623505.

It is an arithmetic number, because the mean of its divisors is an integer number (623505).

2^1247009 is an apocalyptic number.

It is an amenable number.

1247009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247009 is an equidigital number, since it uses as much as digits as its factorization.

1247009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1247009 is about 1116.6955717652. The cubic root of 1247009 is about 107.6357470260.

The spelling of 1247009 in words is "one million, two hundred forty-seven thousand, nine".