1264005269 has 2 divisors, whose sum is σ = 1264005270. Its totient is φ = 1264005268.

The previous prime is 1264005251. The next prime is 1264005271. The reversal of 1264005269 is 9625004621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1058656369 + 205348900 = 32537^2 + 14330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264005269 - 2⁸ = 1264005013 is a prime.

It is a super-2 number, since 2×1264005269² = 3195418640119524722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1264005271, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264005289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632002634 + 632002635.

It is an arithmetic number, because the mean of its divisors is an integer number (632002635).

Almost surely, 2^1264005269 is an apocalyptic number.

It is an amenable number.

1264005269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264005269 is an equidigital number, since it uses as much as digits as its factorization.

1264005269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1264005269 is about 35552.8517702870. The cubic root of 1264005269 is about 1081.2255375133.

The spelling of 1264005269 in words is "one billion, two hundred sixty-four million, five thousand, two hundred sixty-nine".