1265285279 has 2 divisors, whose sum is σ = 1265285280. Its totient is φ = 1265285278.

The previous prime is 1265285239. The next prime is 1265285293. The reversal of 1265285279 is 9725825621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265285279 - 2¹² = 1265281183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265285209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632642639 + 632642640.

It is an arithmetic number, because the mean of its divisors is an integer number (632642640).

Almost surely, 2^1265285279 is an apocalyptic number.

1265285279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265285279 is an equidigital number, since it uses as much as digits as its factorization.

1265285279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 1265285279 is about 35570.8487247634. The cubic root of 1265285279 is about 1081.5903863604.

The spelling of 1265285279 in words is "one billion, two hundred sixty-five million, two hundred eighty-five thousand, two hundred seventy-nine".