265220581 has 2 divisors, whose sum is σ = 265220582. Its totient is φ = 265220580.

The previous prime is 265220539. The next prime is 265220609. The reversal of 265220581 is 185022562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140541025 + 124679556 = 11855^2 + 11166^2 .

It is a cyclic number.

It is not a de Polignac number, because 265220581 - 2⁷ = 265220453 is a prime.

It is a super-2 number, since 2×265220581² = 140683913171955122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265221581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132610290 + 132610291.

It is an arithmetic number, because the mean of its divisors is an integer number (132610291).

Almost surely, 2^265220581 is an apocalyptic number.

It is an amenable number.

265220581 is a deficient number, since it is larger than the sum of its proper divisors (1).

265220581 is an equidigital number, since it uses as much as digits as its factorization.

265220581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 265220581 is about 16285.5942783799. The cubic root of 265220581 is about 642.4939966231.

The spelling of 265220581 in words is "two hundred sixty-five million, two hundred twenty thousand, five hundred eighty-one".