1265213317 has 2 divisors, whose sum is σ = 1265213318. Its totient is φ = 1265213316.

The previous prime is 1265213309. The next prime is 1265213353. The reversal of 1265213317 is 7133125621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917726436 + 347486881 = 30294^2 + 18641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265213317 - 2³ = 1265213309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265213387) 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, 632606658 + 632606659.

It is an arithmetic number, because the mean of its divisors is an integer number (632606659).

Almost surely, 2^1265213317 is an apocalyptic number.

It is an amenable number.

1265213317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265213317 is an equidigital number, since it uses as much as digits as its factorization.

1265213317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 1265213317 is about 35569.8371798354. The cubic root of 1265213317 is about 1081.5698811340.

Adding to 1265213317 its reverse (7133125621), we get a palindrome (8398338938).

The spelling of 1265213317 in words is "one billion, two hundred sixty-five million, two hundred thirteen thousand, three hundred seventeen".