265822261 has 2 divisors, whose sum is σ = 265822262. Its totient is φ = 265822260.

The previous prime is 265822163. The next prime is 265822279. The reversal of 265822261 is 162228562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 13616100 = 15881^2 + 3690^2 .

It is a cyclic number.

It is not a de Polignac number, because 265822261 - 2¹³ = 265814069 is a prime.

It is a super-2 number, since 2×265822261² = 141322948886304242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265826261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132911130 + 132911131.

It is an arithmetic number, because the mean of its divisors is an integer number (132911131).

Almost surely, 2^265822261 is an apocalyptic number.

It is an amenable number.

265822261 is a deficient number, since it is larger than the sum of its proper divisors (1).

265822261 is an equidigital number, since it uses as much as digits as its factorization.

265822261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 265822261 is about 16304.0565811089. The cubic root of 265822261 is about 642.9794841186.

The spelling of 265822261 in words is "two hundred sixty-five million, eight hundred twenty-two thousand, two hundred sixty-one".