263040521 has 2 divisors, whose sum is σ = 263040522. Its totient is φ = 263040520.

The previous prime is 263040499. The next prime is 263040571. The reversal of 263040521 is 125040362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236052496 + 26988025 = 15364^2 + 5195^2 .

It is a cyclic number.

It is not a de Polignac number, because 263040521 - 2¹⁴ = 263024137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (263040571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131520260 + 131520261.

It is an arithmetic number, because the mean of its divisors is an integer number (131520261).

Almost surely, 2^263040521 is an apocalyptic number.

It is an amenable number.

263040521 is a deficient number, since it is larger than the sum of its proper divisors (1).

263040521 is an equidigital number, since it uses as much as digits as its factorization.

263040521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 263040521 is about 16218.5240080594. The cubic root of 263040521 is about 640.7287605115.

Adding to 263040521 its reverse (125040362), we get a palindrome (388080883).

The spelling of 263040521 in words is "two hundred sixty-three million, forty thousand, five hundred twenty-one".