265240009 has 2 divisors, whose sum is σ = 265240010. Its totient is φ = 265240008.

The previous prime is 265240007. The next prime is 265240033. The reversal of 265240009 is 900042562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239382784 + 25857225 = 15472^2 + 5085^2 .

It is a cyclic number.

It is not a de Polignac number, because 265240009 - 2¹ = 265240007 is a prime.

Together with 265240007, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265240007) 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, 132620004 + 132620005.

It is an arithmetic number, because the mean of its divisors is an integer number (132620005).

Almost surely, 2^265240009 is an apocalyptic number.

It is an amenable number.

265240009 is a deficient number, since it is larger than the sum of its proper divisors (1).

265240009 is an equidigital number, since it uses as much as digits as its factorization.

265240009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 265240009 is about 16286.1907455365. The cubic root of 265240009 is about 642.5096842802.

The spelling of 265240009 in words is "two hundred sixty-five million, two hundred forty thousand, nine".