265535321 has 2 divisors, whose sum is σ = 265535322. Its totient is φ = 265535320.

The previous prime is 265535287. The next prime is 265535323. The reversal of 265535321 is 123535562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156625225 + 108910096 = 12515^2 + 10436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265535321 is a prime.

It is a Sophie Germain prime.

Together with 265535323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (265535323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132767660 + 132767661.

It is an arithmetic number, because the mean of its divisors is an integer number (132767661).

Almost surely, 2^265535321 is an apocalyptic number.

It is an amenable number.

265535321 is a deficient number, since it is larger than the sum of its proper divisors (1).

265535321 is an equidigital number, since it uses as much as digits as its factorization.

265535321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 32.

The square root of 265535321 is about 16295.2545546242. The cubic root of 265535321 is about 642.7480475730.

The spelling of 265535321 in words is "two hundred sixty-five million, five hundred thirty-five thousand, three hundred twenty-one".