1265265109 has 2 divisors, whose sum is σ = 1265265110. Its totient is φ = 1265265108.

The previous prime is 1265265107. The next prime is 1265265139. The reversal of 1265265109 is 9015625621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1216474884 + 48790225 = 34878^2 + 6985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265265109 - 2¹ = 1265265107 is a prime.

Together with 1265265107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265265107) 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, 632632554 + 632632555.

It is an arithmetic number, because the mean of its divisors is an integer number (632632555).

Almost surely, 2^1265265109 is an apocalyptic number.

It is an amenable number.

1265265109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265265109 is an equidigital number, since it uses as much as digits as its factorization.

1265265109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1265265109 is about 35570.5652049556. The cubic root of 1265265109 is about 1081.5846390941.

The spelling of 1265265109 in words is "one billion, two hundred sixty-five million, two hundred sixty-five thousand, one hundred nine".