265620217 has 2 divisors, whose sum is σ = 265620218. Its totient is φ = 265620216.

The previous prime is 265620197. The next prime is 265620253. The reversal of 265620217 is 712026562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213043216 + 52577001 = 14596^2 + 7251^2 .

It is a cyclic number.

It is not a de Polignac number, because 265620217 - 2¹¹ = 265618169 is a prime.

It is not a weakly prime, because it can be changed into another prime (265620517) 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, 132810108 + 132810109.

It is an arithmetic number, because the mean of its divisors is an integer number (132810109).

Almost surely, 2^265620217 is an apocalyptic number.

It is an amenable number.

265620217 is a deficient number, since it is larger than the sum of its proper divisors (1).

265620217 is an equidigital number, since it uses as much as digits as its factorization.

265620217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 265620217 is about 16297.8592766044. The cubic root of 265620217 is about 642.8165393073.

Adding to 265620217 its reverse (712026562), we get a palindrome (977646779).

The spelling of 265620217 in words is "two hundred sixty-five million, six hundred twenty thousand, two hundred seventeen".