1265240369 has 2 divisors, whose sum is σ = 1265240370. Its totient is φ = 1265240368.

The previous prime is 1265240341. The next prime is 1265240387. The reversal of 1265240369 is 9630425621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1259895025 + 5345344 = 35495^2 + 2312^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265240369 - 2²⁰ = 1264191793 is a prime.

It is a super-3 number, since 3×1265240369³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1265240069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632620184 + 632620185.

It is an arithmetic number, because the mean of its divisors is an integer number (632620185).

Almost surely, 2^1265240369 is an apocalyptic number.

It is an amenable number.

1265240369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265240369 is an equidigital number, since it uses as much as digits as its factorization.

1265240369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1265240369 is about 35570.2174438111. The cubic root of 1265240369 is about 1081.5775895627.

The spelling of 1265240369 in words is "one billion, two hundred sixty-five million, two hundred forty thousand, three hundred sixty-nine".