265315261 has 2 divisors, whose sum is σ = 265315262. Its totient is φ = 265315260.

The previous prime is 265315249. The next prime is 265315279. The reversal of 265315261 is 162513562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185123236 + 80192025 = 13606^2 + 8955^2 .

It is a cyclic number.

It is not a de Polignac number, because 265315261 - 2⁷ = 265315133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265315201) 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, 132657630 + 132657631.

It is an arithmetic number, because the mean of its divisors is an integer number (132657631).

Almost surely, 2^265315261 is an apocalyptic number.

It is an amenable number.

265315261 is a deficient number, since it is larger than the sum of its proper divisors (1).

265315261 is an equidigital number, since it uses as much as digits as its factorization.

265315261 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 265315261 is about 16288.5008825245. The cubic root of 265315261 is about 642.5704412869.

The spelling of 265315261 in words is "two hundred sixty-five million, three hundred fifteen thousand, two hundred sixty-one".