265135261 has 2 divisors, whose sum is σ = 265135262. Its totient is φ = 265135260.

The previous prime is 265135249. The next prime is 265135271. The reversal of 265135261 is 162531562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168506361 + 96628900 = 12981^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 265135261 - 2²⁵ = 231580829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265135271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132567630 + 132567631.

It is an arithmetic number, because the mean of its divisors is an integer number (132567631).

Almost surely, 2^265135261 is an apocalyptic number.

It is an amenable number.

265135261 is a deficient number, since it is larger than the sum of its proper divisors (1).

265135261 is an equidigital number, since it uses as much as digits as its factorization.

265135261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 265135261 is about 16282.9745746900. The cubic root of 265135261 is about 642.4250936408.

The spelling of 265135261 in words is "two hundred sixty-five million, one hundred thirty-five thousand, two hundred sixty-one".