265511 has 2 divisors, whose sum is σ = 265512. Its totient is φ = 265510.

The previous prime is 265493. The next prime is 265513. The reversal of 265511 is 115562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265511 - 2¹⁰ = 264487 is a prime.

It is a super-2 number, since 2×265511² = 140992182242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 265513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132755 + 132756.

It is an arithmetic number, because the mean of its divisors is an integer number (132756).

2²⁶⁵⁵¹¹ is an apocalyptic number.

265511 is a deficient number, since it is larger than the sum of its proper divisors (1).

265511 is an equidigital number, since it uses as much as digits as its factorization.

265511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 20.

The square root of 265511 is about 515.2775950883. The cubic root of 265511 is about 64.2728423376.

The spelling of 265511 in words is "two hundred sixty-five thousand, five hundred eleven".