265221317 has 2 divisors, whose sum is σ = 265221318. Its totient is φ = 265221316.

The previous prime is 265221197. The next prime is 265221331. The reversal of 265221317 is 713122562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248566756 + 16654561 = 15766^2 + 4081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265221317 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265221317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265221347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132610658 + 132610659.

It is an arithmetic number, because the mean of its divisors is an integer number (132610659).

Almost surely, 2^265221317 is an apocalyptic number.

It is an amenable number.

265221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

265221317 is an equidigital number, since it uses as much as digits as its factorization.

265221317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 265221317 is about 16285.6168750220. The cubic root of 265221317 is about 642.4945909399.

Adding to 265221317 its reverse (713122562), we get a palindrome (978343879).

The spelling of 265221317 in words is "two hundred sixty-five million, two hundred twenty-one thousand, three hundred seventeen".