1264266649 has 2 divisors, whose sum is σ = 1264266650. Its totient is φ = 1264266648.

The previous prime is 1264266613. The next prime is 1264266667. The reversal of 1264266649 is 9466624621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1172720025 + 91546624 = 34245^2 + 9568^2 .

It is an emirp because it is prime and its reverse (9466624621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1264266649 - 2¹¹ = 1264264601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1264266599 and 1264266608.

It is not a weakly prime, because it can be changed into another prime (1264266749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632133324 + 632133325.

It is an arithmetic number, because the mean of its divisors is an integer number (632133325).

Almost surely, 2^1264266649 is an apocalyptic number.

It is an amenable number.

1264266649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264266649 is an equidigital number, since it uses as much as digits as its factorization.

1264266649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 46.

The square root of 1264266649 is about 35556.5275160553. The cubic root of 1264266649 is about 1081.3000602125.

The spelling of 1264266649 in words is "one billion, two hundred sixty-four million, two hundred sixty-six thousand, six hundred forty-nine".