565261261 has 2 divisors, whose sum is σ = 565261262. Its totient is φ = 565261260.

The previous prime is 565261259. The next prime is 565261331. The reversal of 565261261 is 162162565.

565261261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369792900 + 195468361 = 19230^2 + 13981^2 .

It is a cyclic number.

It is not a de Polignac number, because 565261261 - 2¹ = 565261259 is a prime.

Together with 565261259, 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 (565261231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282630630 + 282630631.

It is an arithmetic number, because the mean of its divisors is an integer number (282630631).

Almost surely, 2^565261261 is an apocalyptic number.

It is an amenable number.

565261261 is a deficient number, since it is larger than the sum of its proper divisors (1).

565261261 is an equidigital number, since it uses as much as digits as its factorization.

565261261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 565261261 is about 23775.2236792843. The cubic root of 565261261 is about 826.8303462278.

The spelling of 565261261 in words is "five hundred sixty-five million, two hundred sixty-one thousand, two hundred sixty-one".