1265287399 has 2 divisors, whose sum is σ = 1265287400. Its totient is φ = 1265287398.

The previous prime is 1265287367. The next prime is 1265287403. The reversal of 1265287399 is 9937825621.

It is a strong prime.

It is an emirp because it is prime and its reverse (9937825621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265287399 - 2⁵ = 1265287367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265287099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632643699 + 632643700.

It is an arithmetic number, because the mean of its divisors is an integer number (632643700).

Almost surely, 2^1265287399 is an apocalyptic number.

1265287399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265287399 is an equidigital number, since it uses as much as digits as its factorization.

1265287399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The square root of 1265287399 is about 35570.8785244334. The cubic root of 1265287399 is about 1081.5909904324.

The spelling of 1265287399 in words is "one billion, two hundred sixty-five million, two hundred eighty-seven thousand, three hundred ninety-nine".