1265263999 has 2 divisors, whose sum is σ = 1265264000. Its totient is φ = 1265263998.

The previous prime is 1265263991. The next prime is 1265264009. The reversal of 1265263999 is 9993625621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265263999 - 2³ = 1265263991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265263991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632631999 + 632632000.

It is an arithmetic number, because the mean of its divisors is an integer number (632632000).

Almost surely, 2^1265263999 is an apocalyptic number.

1265263999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265263999 is an equidigital number, since it uses as much as digits as its factorization.

1265263999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 52.

The square root of 1265263999 is about 35570.5496021639. The cubic root of 1265263999 is about 1081.5843228075.

The spelling of 1265263999 in words is "one billion, two hundred sixty-five million, two hundred sixty-three thousand, nine hundred ninety-nine".