265381 has 2 divisors, whose sum is σ = 265382. Its totient is φ = 265380.

The previous prime is 265339. The next prime is 265399. The reversal of 265381 is 183562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 25281 = 490^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 265381 - 2¹³ = 257189 is a prime.

It is a super-2 number, since 2×265381² = 140854150322, which contains 22 as substring.

265381 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132690 + 132691.

It is an arithmetic number, because the mean of its divisors is an integer number (132691).

2²⁶⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

265381 is a deficient number, since it is larger than the sum of its proper divisors (1).

265381 is an equidigital number, since it uses as much as digits as its factorization.

265381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 265381 is about 515.1514340463. The cubic root of 265381 is about 64.2623508281.

Subtracting from 265381 its sum of digits (25), we obtain a triangular number (265356 = T₇₂₈).

It can be divided in two parts, 265 and 381, that added together give a palindrome (646).

The spelling of 265381 in words is "two hundred sixty-five thousand, three hundred eighty-one".