1266449909 has 2 divisors, whose sum is σ = 1266449910. Its totient is φ = 1266449908.

The previous prime is 1266449887. The next prime is 1266449929. The reversal of 1266449909 is 9099446621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1203881809 + 62568100 = 34697^2 + 7910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266449909 - 2²⁸ = 998014453 is a prime.

It is a super-2 number, since 2×1266449909² = 3207790744012216562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266449929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633224954 + 633224955.

It is an arithmetic number, because the mean of its divisors is an integer number (633224955).

Almost surely, 2^1266449909 is an apocalyptic number.

It is an amenable number.

1266449909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266449909 is an equidigital number, since it uses as much as digits as its factorization.

1266449909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1266449909 is about 35587.2155274896. The cubic root of 1266449909 is about 1081.9221340298.

The spelling of 1266449909 in words is "one billion, two hundred sixty-six million, four hundred forty-nine thousand, nine hundred nine".