265781 has 2 divisors, whose sum is σ = 265782. Its totient is φ = 265780.

The previous prime is 265757. The next prime is 265787. The reversal of 265781 is 187562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 128881 = 370^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 265781 - 2⁶ = 265717 is a prime.

It is a super-2 number, since 2×265781² = 141279079922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132890 + 132891.

It is an arithmetic number, because the mean of its divisors is an integer number (132891).

2²⁶⁵⁷⁸¹ is an apocalyptic number.

It is an amenable number.

265781 is a deficient number, since it is larger than the sum of its proper divisors (1).

265781 is an equidigital number, since it uses as much as digits as its factorization.

265781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 265781 is about 515.5395232182. The cubic root of 265781 is about 64.2946214583.

The spelling of 265781 in words is "two hundred sixty-five thousand, seven hundred eighty-one".