1265015281 has 2 divisors, whose sum is σ = 1265015282. Its totient is φ = 1265015280.

The previous prime is 1265015261. The next prime is 1265015287. The reversal of 1265015281 is 1825105621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1261386256 + 3629025 = 35516^2 + 1905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265015281 is a prime.

It is a super-2 number, since 2×1265015281² = 3200527322327017922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1265015287) 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, 632507640 + 632507641.

It is an arithmetic number, because the mean of its divisors is an integer number (632507641).

Almost surely, 2^1265015281 is an apocalyptic number.

It is an amenable number.

1265015281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265015281 is an equidigital number, since it uses as much as digits as its factorization.

1265015281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 1265015281 is about 35567.0533078016. The cubic root of 1265015281 is about 1081.5134477125.

The spelling of 1265015281 in words is "one billion, two hundred sixty-five million, fifteen thousand, two hundred eighty-one".